From fce4c9d75438662db85809d35e3fbdf37a6697d4 Mon Sep 17 00:00:00 2001
From: bretthadley <brett.hadley@redbrain.com>
Date: Tue, 5 May 2020 13:37:25 +0100
Subject: [PATCH 1/8] add onGPTScriptLoadError event tro catch when browsers
 block things

---
 js/dfpslotsprovider.js | 17 ++++++++++++++++-
 js/manager.js          |  9 ++++++++-
 2 files changed, 24 insertions(+), 2 deletions(-)

diff --git a/js/dfpslotsprovider.js b/js/dfpslotsprovider.js
index fb069c6..6998941 100644
--- a/js/dfpslotsprovider.js
+++ b/js/dfpslotsprovider.js
@@ -51,6 +51,7 @@ export default class DFPSlotsProvider extends React.Component {
         mobileScaling: PropTypes.number,
       }),
     ]),
+    onGPTScriptLoadError: PropTypes.func
   };
 
   static defaultProps = {
@@ -84,6 +85,7 @@ export default class DFPSlotsProvider extends React.Component {
     this.getContextValue = this.getContextValue.bind(this);
     this.loadAlreadyCalled = false;
     this.loadCallbackAttached = false;
+    this.gptLoadErrorCallbackAttached = false;
     this.shouldReloadAds = false;
     this.totalSlots = 0;
     this.contextValue = {};
@@ -97,6 +99,8 @@ export default class DFPSlotsProvider extends React.Component {
     if (this.props.autoLoad && !this.loadAdsIfPossible()) {
       this.attachLoadCallback();
     }
+
+    this.attachGPTLoadErrorCallback();
   }
 
   shouldComponentUpdate(nextProps) {
@@ -163,7 +167,6 @@ export default class DFPSlotsProvider extends React.Component {
     DFPManager.configureSingleRequest(this.props.singleRequest);
     DFPManager.configureDisableInitialLoad(this.props.disableInitialLoad);
     DFPManager.configureLazyLoad(
-      !!this.props.lazyLoad,
       typeof this.props.lazyLoad === 'boolean' ? null : this.props.lazyLoad,
     );
     DFPManager.setAdSenseAttributes(this.props.adSenseAttributes);
@@ -179,6 +182,18 @@ export default class DFPSlotsProvider extends React.Component {
     return false;
   }
 
+  attachGPTLoadErrorCallback() {
+    if(this.gptLoadErrorCallbackAttached === false) {
+      DFPManager.attachGPTLoadErrorCallback(function(data) {
+        if(this.props.onGPTScriptLoadError) {
+          this.props.onGPTScriptLoadError()
+        }
+      })
+
+      this.gptLoadErrorCallbackAttached = true;
+    }
+  }
+
   // pretty strait-forward interface that children ad slots use to register
   // with their DFPSlotProvider parent node.
   newSlotCallback() {
diff --git a/js/manager.js b/js/manager.js
index df54b90..2d1eaab 100644
--- a/js/manager.js
+++ b/js/manager.js
@@ -151,7 +151,10 @@ const DFPManager = Object.assign(new EventEmitter().setMaxListeners(0), {
 
   getGoogletag() {
     if (googleGPTScriptLoadPromise === null) {
-      googleGPTScriptLoadPromise = Utils.loadGPTScript();
+      googleGPTScriptLoadPromise = Utils.loadGPTScript()
+      .catch((error) => {
+        this.emit('gptScriptLoadError', { error })
+      });
     }
     return googleGPTScriptLoadPromise;
   },
@@ -424,6 +427,10 @@ const DFPManager = Object.assign(new EventEmitter().setMaxListeners(0), {
     return registeredSlots;
   },
 
+  attachGPTLoadError(cb) {
+    this.on('gptScriptLoadError', cb);
+  },
+
   attachSlotRenderEnded(cb) {
     this.on('slotRenderEnded', cb);
   },

From dbbf844f62681e12715ef3a8eae0c5f132bfb839 Mon Sep 17 00:00:00 2001
From: bretthadley <brett.hadley@redbrain.com>
Date: Tue, 5 May 2020 13:54:33 +0100
Subject: [PATCH 2/8] build it

---
 lib/adslot.js           | 122 +++++++++++++++++---------------
 lib/dfpslotsprovider.js | 151 +++++++++++++++++++++++-----------------
 lib/index.js            |   8 +--
 lib/manager.js          |  83 ++++++++++++----------
 4 files changed, 202 insertions(+), 162 deletions(-)

diff --git a/lib/adslot.js b/lib/adslot.js
index 5468f17..ea72fac 100644
--- a/lib/adslot.js
+++ b/lib/adslot.js
@@ -3,7 +3,7 @@
 Object.defineProperty(exports, "__esModule", {
   value: true
 });
-exports.default = exports.AdSlot = void 0;
+exports["default"] = exports.AdSlot = void 0;
 
 var _react = _interopRequireDefault(require("react"));
 
@@ -13,13 +13,15 @@ var _manager = _interopRequireDefault(require("./manager"));
 
 var _dfpslotsprovider = require("./dfpslotsprovider");
 
-function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { "default": obj }; }
 
-function _typeof(obj) { if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); }
+function _typeof(obj) { "@babel/helpers - typeof"; if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); }
 
 function _extends() { _extends = Object.assign || function (target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i]; for (var key in source) { if (Object.prototype.hasOwnProperty.call(source, key)) { target[key] = source[key]; } } } return target; }; return _extends.apply(this, arguments); }
 
-function _objectSpread(target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i] != null ? arguments[i] : {}; var ownKeys = Object.keys(source); if (typeof Object.getOwnPropertySymbols === 'function') { ownKeys = ownKeys.concat(Object.getOwnPropertySymbols(source).filter(function (sym) { return Object.getOwnPropertyDescriptor(source, sym).enumerable; })); } ownKeys.forEach(function (key) { _defineProperty(target, key, source[key]); }); } return target; }
+function ownKeys(object, enumerableOnly) { var keys = Object.keys(object); if (Object.getOwnPropertySymbols) { var symbols = Object.getOwnPropertySymbols(object); if (enumerableOnly) symbols = symbols.filter(function (sym) { return Object.getOwnPropertyDescriptor(object, sym).enumerable; }); keys.push.apply(keys, symbols); } return keys; }
+
+function _objectSpread(target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i] != null ? arguments[i] : {}; if (i % 2) { ownKeys(Object(source), true).forEach(function (key) { _defineProperty(target, key, source[key]); }); } else if (Object.getOwnPropertyDescriptors) { Object.defineProperties(target, Object.getOwnPropertyDescriptors(source)); } else { ownKeys(Object(source)).forEach(function (key) { Object.defineProperty(target, key, Object.getOwnPropertyDescriptor(source, key)); }); } } return target; }
 
 function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
 
@@ -27,46 +29,50 @@ function _defineProperties(target, props) { for (var i = 0; i < props.length; i+
 
 function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }
 
-function _possibleConstructorReturn(self, call) { if (call && (_typeof(call) === "object" || typeof call === "function")) { return call; } return _assertThisInitialized(self); }
-
-function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }
-
 function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); if (superClass) _setPrototypeOf(subClass, superClass); }
 
 function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
 
+function _createSuper(Derived) { var hasNativeReflectConstruct = _isNativeReflectConstruct(); return function () { var Super = _getPrototypeOf(Derived), result; if (hasNativeReflectConstruct) { var NewTarget = _getPrototypeOf(this).constructor; result = Reflect.construct(Super, arguments, NewTarget); } else { result = Super.apply(this, arguments); } return _possibleConstructorReturn(this, result); }; }
+
+function _possibleConstructorReturn(self, call) { if (call && (_typeof(call) === "object" || typeof call === "function")) { return call; } return _assertThisInitialized(self); }
+
 function _assertThisInitialized(self) { if (self === void 0) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return self; }
 
+function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct) return false; if (Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { Date.prototype.toString.call(Reflect.construct(Date, [], function () {})); return true; } catch (e) { return false; } }
+
+function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }
+
 function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
 
 var dynamicAdCount = 0;
 
-var AdSlot =
-/*#__PURE__*/
-function (_React$Component) {
+var AdSlot = /*#__PURE__*/function (_React$Component) {
   _inherits(AdSlot, _React$Component);
 
+  var _super = _createSuper(AdSlot);
+
   function AdSlot(props) {
     var _this;
 
     _classCallCheck(this, AdSlot);
 
-    _this = _possibleConstructorReturn(this, _getPrototypeOf(AdSlot).call(this, props));
-    _this.doRegisterSlot = _this.doRegisterSlot.bind(_assertThisInitialized(_assertThisInitialized(_this)));
-    _this.generateSlotId = _this.generateSlotId.bind(_assertThisInitialized(_assertThisInitialized(_this)));
-    _this.getSlotId = _this.getSlotId.bind(_assertThisInitialized(_assertThisInitialized(_this)));
-    _this.mapContextToAdSlotProps = _this.mapContextToAdSlotProps.bind(_assertThisInitialized(_assertThisInitialized(_this)));
-    _this.slotShouldRefresh = _this.slotShouldRefresh.bind(_assertThisInitialized(_assertThisInitialized(_this)));
-    _this.slotRenderEnded = _this.slotRenderEnded.bind(_assertThisInitialized(_assertThisInitialized(_this)));
-    _this.slotRegisterCallback = _this.slotRegisterCallback.bind(_assertThisInitialized(_assertThisInitialized(_this)));
-    _this.slotIsViewable = _this.slotIsViewable.bind(_assertThisInitialized(_assertThisInitialized(_this)));
-    _this.slotVisibilityChanged = _this.slotVisibilityChanged.bind(_assertThisInitialized(_assertThisInitialized(_this)));
-    _this.getClasses = _this.getClasses.bind(_assertThisInitialized(_assertThisInitialized(_this)));
+    _this = _super.call(this, props);
+    _this.doRegisterSlot = _this.doRegisterSlot.bind(_assertThisInitialized(_this));
+    _this.generateSlotId = _this.generateSlotId.bind(_assertThisInitialized(_this));
+    _this.getSlotId = _this.getSlotId.bind(_assertThisInitialized(_this));
+    _this.mapContextToAdSlotProps = _this.mapContextToAdSlotProps.bind(_assertThisInitialized(_this));
+    _this.slotShouldRefresh = _this.slotShouldRefresh.bind(_assertThisInitialized(_this));
+    _this.slotRenderEnded = _this.slotRenderEnded.bind(_assertThisInitialized(_this));
+    _this.slotRegisterCallback = _this.slotRegisterCallback.bind(_assertThisInitialized(_this));
+    _this.slotIsViewable = _this.slotIsViewable.bind(_assertThisInitialized(_this));
+    _this.slotVisibilityChanged = _this.slotVisibilityChanged.bind(_assertThisInitialized(_this));
+    _this.getClasses = _this.getClasses.bind(_assertThisInitialized(_this));
     _this.state = {
       slotId: _this.props.slotId || null,
       className: _this.props.className || ''
     };
-    _this.adElementRef = _react.default.createRef ? _react.default.createRef() : function (element) {
+    _this.adElementRef = _react["default"].createRef ? _react["default"].createRef() : function (element) {
       _this.adElementRef = element;
     };
     return _this;
@@ -132,19 +138,19 @@ function (_React$Component) {
   }, {
     key: "doRegisterSlot",
     value: function doRegisterSlot() {
-      _manager.default.registerSlot(_objectSpread({}, this.mapContextToAdSlotProps(), this.props, this.state, {
+      _manager["default"].registerSlot(_objectSpread(_objectSpread(_objectSpread(_objectSpread({}, this.mapContextToAdSlotProps()), this.props), this.state), {}, {
         slotShouldRefresh: this.slotShouldRefresh
       }));
 
       if (this.props.fetchNow === true) {
-        _manager.default.load(this.getSlotId());
+        _manager["default"].load(this.getSlotId());
       }
 
-      _manager.default.attachSlotRenderEnded(this.slotRenderEnded);
+      _manager["default"].attachSlotRenderEnded(this.slotRenderEnded);
 
-      _manager.default.attachSlotIsViewable(this.slotIsViewable);
+      _manager["default"].attachSlotIsViewable(this.slotIsViewable);
 
-      _manager.default.attachSlotVisibilityChanged(this.slotVisibilityChanged);
+      _manager["default"].attachSlotVisibilityChanged(this.slotVisibilityChanged);
 
       this.slotRegisterCallback();
     }
@@ -162,13 +168,13 @@ function (_React$Component) {
   }, {
     key: "unregisterSlot",
     value: function unregisterSlot() {
-      _manager.default.unregisterSlot(_objectSpread({}, this.mapContextToAdSlotProps(), this.props, this.state));
+      _manager["default"].unregisterSlot(_objectSpread(_objectSpread(_objectSpread({}, this.mapContextToAdSlotProps()), this.props), this.state));
 
-      _manager.default.detachSlotRenderEnded(this.slotRenderEnded);
+      _manager["default"].detachSlotRenderEnded(this.slotRenderEnded);
 
-      _manager.default.detachSlotIsViewable(this.slotIsViewable);
+      _manager["default"].detachSlotIsViewable(this.slotIsViewable);
 
-      _manager.default.detachSlotVisibilityChanged(this.slotVisibilityChanged);
+      _manager["default"].detachSlotVisibilityChanged(this.slotVisibilityChanged);
     }
   }, {
     key: "slotRenderEnded",
@@ -176,7 +182,7 @@ function (_React$Component) {
       if (eventData.slotId === this.getSlotId()) {
         if (this.props.onSlotRender !== undefined) {
           // now that slot has rendered we have access to the ref
-          var params = _objectSpread({}, eventData, {
+          var params = _objectSpread(_objectSpread({}, eventData), {}, {
             adElementRef: this.adElementRef
           });
 
@@ -220,7 +226,7 @@ function (_React$Component) {
       var r = true;
 
       if (this.props.shouldRefresh !== undefined) {
-        r = this.props.shouldRefresh(_objectSpread({}, this.mapContextToAdSlotProps(), this.props, {
+        r = this.props.shouldRefresh(_objectSpread(_objectSpread(_objectSpread({}, this.mapContextToAdSlotProps()), this.props), {}, {
           slotId: this.getSlotId()
         }));
       }
@@ -239,35 +245,35 @@ function (_React$Component) {
         props.id = slotId;
       }
 
-      return _react.default.createElement("div", {
+      return /*#__PURE__*/_react["default"].createElement("div", {
         className: this.getClasses().join(' ').trim()
-      }, _react.default.createElement("div", _extends({
+      }, /*#__PURE__*/_react["default"].createElement("div", _extends({
         ref: this.adElementRef
       }, props)));
     }
   }]);
 
   return AdSlot;
-}(_react.default.Component);
+}(_react["default"].Component);
 
 exports.AdSlot = AdSlot;
 
 _defineProperty(AdSlot, "propTypes", {
-  dfpNetworkId: _propTypes.default.string,
-  adUnit: _propTypes.default.string,
-  sizes: _propTypes.default.arrayOf(_propTypes.default.oneOfType([_propTypes.default.arrayOf(_propTypes.default.number), _propTypes.default.string])),
-  renderOutOfThePage: _propTypes.default.bool,
-  sizeMapping: _propTypes.default.arrayOf(_propTypes.default.object),
-  fetchNow: _propTypes.default.bool,
-  adSenseAttributes: _propTypes.default.object,
-  targetingArguments: _propTypes.default.object,
-  onSlotRender: _propTypes.default.func,
-  onSlotRegister: _propTypes.default.func,
-  onSlotIsViewable: _propTypes.default.func,
-  onSlotVisibilityChanged: _propTypes.default.func,
-  shouldRefresh: _propTypes.default.func,
-  slotId: _propTypes.default.string,
-  className: _propTypes.default.string
+  dfpNetworkId: _propTypes["default"].string,
+  adUnit: _propTypes["default"].string,
+  sizes: _propTypes["default"].arrayOf(_propTypes["default"].oneOfType([_propTypes["default"].arrayOf(_propTypes["default"].number), _propTypes["default"].string])),
+  renderOutOfThePage: _propTypes["default"].bool,
+  sizeMapping: _propTypes["default"].arrayOf(_propTypes["default"].object),
+  fetchNow: _propTypes["default"].bool,
+  adSenseAttributes: _propTypes["default"].object,
+  targetingArguments: _propTypes["default"].object,
+  onSlotRender: _propTypes["default"].func,
+  onSlotRegister: _propTypes["default"].func,
+  onSlotIsViewable: _propTypes["default"].func,
+  onSlotVisibilityChanged: _propTypes["default"].func,
+  shouldRefresh: _propTypes["default"].func,
+  slotId: _propTypes["default"].string,
+  className: _propTypes["default"].string
 });
 
 _defineProperty(AdSlot, "defaultProps", {
@@ -277,15 +283,15 @@ _defineProperty(AdSlot, "defaultProps", {
 if (_dfpslotsprovider.Context === null) {
   // React < 16.3
   AdSlot.contextTypes = {
-    dfpNetworkId: _propTypes.default.string,
-    dfpAdUnit: _propTypes.default.string,
-    dfpSizeMapping: _propTypes.default.arrayOf(_propTypes.default.object),
-    dfpTargetingArguments: _propTypes.default.object,
-    newSlotCallback: _propTypes.default.func
+    dfpNetworkId: _propTypes["default"].string,
+    dfpAdUnit: _propTypes["default"].string,
+    dfpSizeMapping: _propTypes["default"].arrayOf(_propTypes["default"].object),
+    dfpTargetingArguments: _propTypes["default"].object,
+    newSlotCallback: _propTypes["default"].func
   };
 } else {
   AdSlot.contextType = _dfpslotsprovider.Context;
 }
 
 var _default = AdSlot;
-exports.default = _default;
\ No newline at end of file
+exports["default"] = _default;
\ No newline at end of file
diff --git a/lib/dfpslotsprovider.js b/lib/dfpslotsprovider.js
index d60a048..bdec0bf 100644
--- a/lib/dfpslotsprovider.js
+++ b/lib/dfpslotsprovider.js
@@ -3,7 +3,7 @@
 Object.defineProperty(exports, "__esModule", {
   value: true
 });
-exports.default = exports.Context = void 0;
+exports["default"] = exports.Context = void 0;
 
 var _react = _interopRequireDefault(require("react"));
 
@@ -11,9 +11,9 @@ var _propTypes = _interopRequireDefault(require("prop-types"));
 
 var _manager = _interopRequireDefault(require("./manager"));
 
-function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { "default": obj }; }
 
-function _typeof(obj) { if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); }
+function _typeof(obj) { "@babel/helpers - typeof"; if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); }
 
 function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
 
@@ -21,20 +21,24 @@ function _defineProperties(target, props) { for (var i = 0; i < props.length; i+
 
 function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }
 
-function _possibleConstructorReturn(self, call) { if (call && (_typeof(call) === "object" || typeof call === "function")) { return call; } return _assertThisInitialized(self); }
-
-function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }
-
 function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); if (superClass) _setPrototypeOf(subClass, superClass); }
 
 function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
 
+function _createSuper(Derived) { var hasNativeReflectConstruct = _isNativeReflectConstruct(); return function () { var Super = _getPrototypeOf(Derived), result; if (hasNativeReflectConstruct) { var NewTarget = _getPrototypeOf(this).constructor; result = Reflect.construct(Super, arguments, NewTarget); } else { result = Super.apply(this, arguments); } return _possibleConstructorReturn(this, result); }; }
+
+function _possibleConstructorReturn(self, call) { if (call && (_typeof(call) === "object" || typeof call === "function")) { return call; } return _assertThisInitialized(self); }
+
 function _assertThisInitialized(self) { if (self === void 0) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return self; }
 
+function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct) return false; if (Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { Date.prototype.toString.call(Reflect.construct(Date, [], function () {})); return true; } catch (e) { return false; } }
+
+function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }
+
 function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
 
 // React.createContext is undefined for React < 16.3
-var Context = _react.default.createContext ? _react.default.createContext({
+var Context = _react["default"].createContext ? _react["default"].createContext({
   dfpNetworkId: null,
   dfpAdUnit: null,
   dfpSizeMapping: null,
@@ -43,25 +47,26 @@ var Context = _react.default.createContext ? _react.default.createContext({
 }) : null;
 exports.Context = Context;
 
-var DFPSlotsProvider =
-/*#__PURE__*/
-function (_React$Component) {
+var DFPSlotsProvider = /*#__PURE__*/function (_React$Component) {
   _inherits(DFPSlotsProvider, _React$Component);
 
+  var _super = _createSuper(DFPSlotsProvider);
+
   function DFPSlotsProvider(props) {
     var _this;
 
     _classCallCheck(this, DFPSlotsProvider);
 
-    _this = _possibleConstructorReturn(this, _getPrototypeOf(DFPSlotsProvider).call(this, props));
-    _this.loadAdsIfPossible = _this.loadAdsIfPossible.bind(_assertThisInitialized(_assertThisInitialized(_this)));
-    _this.newSlotCallback = _this.newSlotCallback.bind(_assertThisInitialized(_assertThisInitialized(_this)));
-    _this.applyConfigs = _this.applyConfigs.bind(_assertThisInitialized(_assertThisInitialized(_this)));
-    _this.shouldReloadConfig = _this.shouldReloadConfig.bind(_assertThisInitialized(_assertThisInitialized(_this)));
-    _this.attachLoadCallback = _this.attachLoadCallback.bind(_assertThisInitialized(_assertThisInitialized(_this)));
-    _this.getContextValue = _this.getContextValue.bind(_assertThisInitialized(_assertThisInitialized(_this)));
+    _this = _super.call(this, props);
+    _this.loadAdsIfPossible = _this.loadAdsIfPossible.bind(_assertThisInitialized(_this));
+    _this.newSlotCallback = _this.newSlotCallback.bind(_assertThisInitialized(_this));
+    _this.applyConfigs = _this.applyConfigs.bind(_assertThisInitialized(_this));
+    _this.shouldReloadConfig = _this.shouldReloadConfig.bind(_assertThisInitialized(_this));
+    _this.attachLoadCallback = _this.attachLoadCallback.bind(_assertThisInitialized(_this));
+    _this.getContextValue = _this.getContextValue.bind(_assertThisInitialized(_this));
     _this.loadAlreadyCalled = false;
     _this.loadCallbackAttached = false;
+    _this.gptLoadErrorCallbackAttached = false;
     _this.shouldReloadAds = false;
     _this.totalSlots = 0;
     _this.contextValue = {};
@@ -83,6 +88,8 @@ function (_React$Component) {
       if (this.props.autoLoad && !this.loadAdsIfPossible()) {
         this.attachLoadCallback();
       }
+
+      this.attachGPTLoadErrorCallback();
     }
   }, {
     key: "shouldComponentUpdate",
@@ -107,7 +114,7 @@ function (_React$Component) {
       if (this.props.autoLoad) {
         if (this.loadAlreadyCalled) {
           if (this.shouldReloadAds) {
-            _manager.default.reload();
+            _manager["default"].reload();
           }
         } else if (!this.loadAdsIfPossible()) {
           this.attachLoadCallback();
@@ -146,29 +153,42 @@ function (_React$Component) {
   }, {
     key: "applyConfigs",
     value: function applyConfigs() {
-      _manager.default.configurePersonalizedAds(this.props.personalizedAds);
+      _manager["default"].configurePersonalizedAds(this.props.personalizedAds);
 
-      _manager.default.configureSingleRequest(this.props.singleRequest);
+      _manager["default"].configureSingleRequest(this.props.singleRequest);
 
-      _manager.default.configureDisableInitialLoad(this.props.disableInitialLoad);
+      _manager["default"].configureDisableInitialLoad(this.props.disableInitialLoad);
 
-      _manager.default.configureLazyLoad(!!this.props.lazyLoad, typeof this.props.lazyLoad === 'boolean' ? null : this.props.lazyLoad);
+      _manager["default"].configureLazyLoad(typeof this.props.lazyLoad === 'boolean' ? null : this.props.lazyLoad);
 
-      _manager.default.setAdSenseAttributes(this.props.adSenseAttributes);
+      _manager["default"].setAdSenseAttributes(this.props.adSenseAttributes);
 
-      _manager.default.setCollapseEmptyDivs(this.props.collapseEmptyDivs);
+      _manager["default"].setCollapseEmptyDivs(this.props.collapseEmptyDivs);
     }
   }, {
     key: "attachLoadCallback",
     value: function attachLoadCallback() {
       if (this.loadCallbackAttached === false) {
-        _manager.default.on('slotRegistered', this.loadAdsIfPossible);
+        _manager["default"].on('slotRegistered', this.loadAdsIfPossible);
 
         this.loadCallbackAttached = true;
         return true;
       }
 
       return false;
+    }
+  }, {
+    key: "attachGPTLoadErrorCallback",
+    value: function attachGPTLoadErrorCallback() {
+      if (this.gptLoadErrorCallbackAttached === false) {
+        _manager["default"].attachGPTLoadErrorCallback(function (data) {
+          if (this.props.onGPTScriptLoadError) {
+            this.props.onGPTScriptLoadError();
+          }
+        });
+
+        this.gptLoadErrorCallbackAttached = true;
+      }
     } // pretty strait-forward interface that children ad slots use to register
     // with their DFPSlotProvider parent node.
 
@@ -185,10 +205,10 @@ function (_React$Component) {
     value: function loadAdsIfPossible() {
       var r = false;
 
-      if (Object.keys(_manager.default.getRegisteredSlots()).length >= this.totalSlots) {
-        _manager.default.removeListener('slotRegistered', this.loadAdsIfPossible);
+      if (Object.keys(_manager["default"].getRegisteredSlots()).length >= this.totalSlots) {
+        _manager["default"].removeListener('slotRegistered', this.loadAdsIfPossible);
 
-        _manager.default.load();
+        _manager["default"].load();
 
         this.loadAlreadyCalled = true;
         this.loadCallbackAttached = false;
@@ -227,47 +247,48 @@ function (_React$Component) {
         return children;
       }
 
-      return _react.default.createElement(Context.Provider, {
+      return /*#__PURE__*/_react["default"].createElement(Context.Provider, {
         value: this.getContextValue()
       }, children);
     }
   }]);
 
   return DFPSlotsProvider;
-}(_react.default.Component);
+}(_react["default"].Component);
 
-exports.default = DFPSlotsProvider;
+exports["default"] = DFPSlotsProvider;
 
 _defineProperty(DFPSlotsProvider, "propTypes", {
-  children: _propTypes.default.oneOfType([_propTypes.default.element, _propTypes.default.array]).isRequired,
-  autoLoad: _propTypes.default.bool,
-  autoReload: _propTypes.default.shape({
-    dfpNetworkId: _propTypes.default.bool,
-    personalizedAds: _propTypes.default.bool,
-    singleRequest: _propTypes.default.bool,
-    disableInitialLoad: _propTypes.default.bool,
-    adUnit: _propTypes.default.bool,
-    sizeMapping: _propTypes.default.bool,
-    adSenseAttributes: _propTypes.default.bool,
-    targetingArguments: _propTypes.default.bool,
-    collapseEmptyDivs: _propTypes.default.bool,
-    lazyLoad: _propTypes.default.bool
+  children: _propTypes["default"].oneOfType([_propTypes["default"].element, _propTypes["default"].array]).isRequired,
+  autoLoad: _propTypes["default"].bool,
+  autoReload: _propTypes["default"].shape({
+    dfpNetworkId: _propTypes["default"].bool,
+    personalizedAds: _propTypes["default"].bool,
+    singleRequest: _propTypes["default"].bool,
+    disableInitialLoad: _propTypes["default"].bool,
+    adUnit: _propTypes["default"].bool,
+    sizeMapping: _propTypes["default"].bool,
+    adSenseAttributes: _propTypes["default"].bool,
+    targetingArguments: _propTypes["default"].bool,
+    collapseEmptyDivs: _propTypes["default"].bool,
+    lazyLoad: _propTypes["default"].bool
   }),
-  dfpNetworkId: _propTypes.default.string.isRequired,
-  personalizedAds: _propTypes.default.bool,
-  singleRequest: _propTypes.default.bool,
-  disableInitialLoad: _propTypes.default.bool,
-  adUnit: _propTypes.default.string,
-  sizeMapping: _propTypes.default.arrayOf(_propTypes.default.object),
-  adSenseAttributes: _propTypes.default.object,
-  targetingArguments: _propTypes.default.object,
-  collapseEmptyDivs: _propTypes.default.oneOfType([_propTypes.default.bool, _propTypes.default.object]),
-  adSenseAttrs: _propTypes.default.object,
-  lazyLoad: _propTypes.default.oneOfType([_propTypes.default.bool, _propTypes.default.shape({
-    fetchMarginPercent: _propTypes.default.number,
-    renderMarginPercent: _propTypes.default.number,
-    mobileScaling: _propTypes.default.number
-  })])
+  dfpNetworkId: _propTypes["default"].string.isRequired,
+  personalizedAds: _propTypes["default"].bool,
+  singleRequest: _propTypes["default"].bool,
+  disableInitialLoad: _propTypes["default"].bool,
+  adUnit: _propTypes["default"].string,
+  sizeMapping: _propTypes["default"].arrayOf(_propTypes["default"].object),
+  adSenseAttributes: _propTypes["default"].object,
+  targetingArguments: _propTypes["default"].object,
+  collapseEmptyDivs: _propTypes["default"].oneOfType([_propTypes["default"].bool, _propTypes["default"].object]),
+  adSenseAttrs: _propTypes["default"].object,
+  lazyLoad: _propTypes["default"].oneOfType([_propTypes["default"].bool, _propTypes["default"].shape({
+    fetchMarginPercent: _propTypes["default"].number,
+    renderMarginPercent: _propTypes["default"].number,
+    mobileScaling: _propTypes["default"].number
+  })]),
+  onGPTScriptLoadError: _propTypes["default"].func
 });
 
 _defineProperty(DFPSlotsProvider, "defaultProps", {
@@ -294,10 +315,10 @@ _defineProperty(DFPSlotsProvider, "defaultProps", {
 if (Context === null) {
   // React < 16.3
   DFPSlotsProvider.childContextTypes = {
-    dfpNetworkId: _propTypes.default.string,
-    dfpAdUnit: _propTypes.default.string,
-    dfpSizeMapping: _propTypes.default.arrayOf(_propTypes.default.object),
-    dfpTargetingArguments: _propTypes.default.object,
-    newSlotCallback: _propTypes.default.func
+    dfpNetworkId: _propTypes["default"].string,
+    dfpAdUnit: _propTypes["default"].string,
+    dfpSizeMapping: _propTypes["default"].arrayOf(_propTypes["default"].object),
+    dfpTargetingArguments: _propTypes["default"].object,
+    newSlotCallback: _propTypes["default"].func
   };
 }
\ No newline at end of file
diff --git a/lib/index.js b/lib/index.js
index b2e94c1..966b2fe 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -11,11 +11,11 @@ var _adslot = _interopRequireDefault(require("./adslot"));
 
 var _dfpslotsprovider = _interopRequireDefault(require("./dfpslotsprovider"));
 
-function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { "default": obj }; }
 
-var DFPManager = _manager.default;
+var DFPManager = _manager["default"];
 exports.DFPManager = DFPManager;
-var AdSlot = _adslot.default;
+var AdSlot = _adslot["default"];
 exports.AdSlot = AdSlot;
-var DFPSlotsProvider = _dfpslotsprovider.default;
+var DFPSlotsProvider = _dfpslotsprovider["default"];
 exports.DFPSlotsProvider = DFPSlotsProvider;
\ No newline at end of file
diff --git a/lib/manager.js b/lib/manager.js
index 05ac54d..5ed0f69 100644
--- a/lib/manager.js
+++ b/lib/manager.js
@@ -3,19 +3,23 @@
 Object.defineProperty(exports, "__esModule", {
   value: true
 });
-exports.default = void 0;
+exports["default"] = void 0;
 
 var _events = require("events");
 
 var Utils = _interopRequireWildcard(require("./utils"));
 
-function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = Object.defineProperty && Object.getOwnPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : {}; if (desc.get || desc.set) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } } newObj.default = obj; return newObj; } }
+function _getRequireWildcardCache() { if (typeof WeakMap !== "function") return null; var cache = new WeakMap(); _getRequireWildcardCache = function _getRequireWildcardCache() { return cache; }; return cache; }
 
-function _objectSpread(target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i] != null ? arguments[i] : {}; var ownKeys = Object.keys(source); if (typeof Object.getOwnPropertySymbols === 'function') { ownKeys = ownKeys.concat(Object.getOwnPropertySymbols(source).filter(function (sym) { return Object.getOwnPropertyDescriptor(source, sym).enumerable; })); } ownKeys.forEach(function (key) { _defineProperty(target, key, source[key]); }); } return target; }
+function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } if (obj === null || _typeof(obj) !== "object" && typeof obj !== "function") { return { "default": obj }; } var cache = _getRequireWildcardCache(); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj["default"] = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
+
+function ownKeys(object, enumerableOnly) { var keys = Object.keys(object); if (Object.getOwnPropertySymbols) { var symbols = Object.getOwnPropertySymbols(object); if (enumerableOnly) symbols = symbols.filter(function (sym) { return Object.getOwnPropertyDescriptor(object, sym).enumerable; }); keys.push.apply(keys, symbols); } return keys; }
+
+function _objectSpread(target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i] != null ? arguments[i] : {}; if (i % 2) { ownKeys(Object(source), true).forEach(function (key) { _defineProperty(target, key, source[key]); }); } else if (Object.getOwnPropertyDescriptors) { Object.defineProperties(target, Object.getOwnPropertyDescriptors(source)); } else { ownKeys(Object(source)).forEach(function (key) { Object.defineProperty(target, key, Object.getOwnPropertyDescriptor(source, key)); }); } } return target; }
 
 function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
 
-function _typeof(obj) { if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); }
+function _typeof(obj) { "@babel/helpers - typeof"; if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); }
 
 var loadPromise = null;
 var googleGPTScriptLoadPromise = null;
@@ -163,8 +167,14 @@ var DFPManager = Object.assign(new _events.EventEmitter().setMaxListeners(0), {
     }
   },
   getGoogletag: function getGoogletag() {
+    var _this2 = this;
+
     if (googleGPTScriptLoadPromise === null) {
-      googleGPTScriptLoadPromise = Utils.loadGPTScript();
+      googleGPTScriptLoadPromise = Utils.loadGPTScript()["catch"](function (error) {
+        _this2.emit('gptScriptLoadError', {
+          error: error
+        });
+      });
     }
 
     return googleGPTScriptLoadPromise;
@@ -173,7 +183,7 @@ var DFPManager = Object.assign(new _events.EventEmitter().setMaxListeners(0), {
     this.collapseEmptyDivs = collapse;
   },
   load: function load() {
-    var _this2 = this;
+    var _this3 = this;
 
     for (var _len = arguments.length, slots = new Array(_len), _key = 0; _key < _len; _key++) {
       slots[_key] = arguments[_key];
@@ -183,7 +193,7 @@ var DFPManager = Object.assign(new _events.EventEmitter().setMaxListeners(0), {
       loadPromise = this.doLoad.apply(this, slots);
     } else {
       loadPromise = loadPromise.then(function () {
-        return _this2.doLoad.apply(_this2, slots);
+        return _this3.doLoad.apply(_this3, slots);
       });
     }
   },
@@ -212,11 +222,11 @@ var DFPManager = Object.assign(new _events.EventEmitter().setMaxListeners(0), {
     return this.gptLoadAds(availableSlots);
   },
   gptLoadAds: function gptLoadAds(slotsToInitialize) {
-    var _this3 = this;
+    var _this4 = this;
 
     return new Promise(function (resolve) {
-      _this3.getGoogletag().then(function (googletag) {
-        _this3.configureInitialOptions(googletag);
+      _this4.getGoogletag().then(function (googletag) {
+        _this4.configureInitialOptions(googletag);
 
         slotsToInitialize.forEach(function (currentSlotId) {
           registeredSlots[currentSlotId].loading = false;
@@ -234,7 +244,7 @@ var DFPManager = Object.assign(new _events.EventEmitter().setMaxListeners(0), {
             if (gptSlot !== null) {
               slot.gptSlot = gptSlot;
 
-              var slotTargetingArguments = _this3.getSlotTargetingArguments(currentSlotId);
+              var slotTargetingArguments = _this4.getSlotTargetingArguments(currentSlotId);
 
               if (slotTargetingArguments !== null) {
                 Object.keys(slotTargetingArguments).forEach(function (varName) {
@@ -244,7 +254,7 @@ var DFPManager = Object.assign(new _events.EventEmitter().setMaxListeners(0), {
                 });
               }
 
-              var slotAdSenseAttributes = _this3.getSlotAdSenseAttributes(currentSlotId);
+              var slotAdSenseAttributes = _this4.getSlotAdSenseAttributes(currentSlotId);
 
               if (slotAdSenseAttributes !== null) {
                 Object.keys(slotAdSenseAttributes).forEach(function (varName) {
@@ -265,12 +275,12 @@ var DFPManager = Object.assign(new _events.EventEmitter().setMaxListeners(0), {
           });
         });
 
-        _this3.configureOptions(googletag);
+        _this4.configureOptions(googletag);
 
         googletag.cmd.push(function () {
           googletag.enableServices();
 
-          if (!_this3.disableInitialLoadIsEnabled()) {
+          if (!_this4.disableInitialLoadIsEnabled()) {
             slotsToInitialize.forEach(function (theSlotId) {
               googletag.display(theSlotId);
             });
@@ -284,22 +294,22 @@ var DFPManager = Object.assign(new _events.EventEmitter().setMaxListeners(0), {
   // configure those gpt parameters that need to be set before pubsads service
   // initialization.
   configureInitialOptions: function configureInitialOptions(googletag) {
-    var _this4 = this;
+    var _this5 = this;
 
     googletag.cmd.push(function () {
-      if (_this4.disableInitialLoadIsEnabled()) {
+      if (_this5.disableInitialLoadIsEnabled()) {
         googletag.pubads().disableInitialLoad();
       }
     });
   },
   configureOptions: function configureOptions(googletag) {
-    var _this5 = this;
+    var _this6 = this;
 
     googletag.cmd.push(function () {
       var pubadsService = googletag.pubads();
-      pubadsService.setRequestNonPersonalizedAds(_this5.personalizedAdsEnabled() ? 0 : 1);
+      pubadsService.setRequestNonPersonalizedAds(_this6.personalizedAdsEnabled() ? 0 : 1);
 
-      var targetingArguments = _this5.getTargetingArguments(); // set global targetting arguments
+      var targetingArguments = _this6.getTargetingArguments(); // set global targetting arguments
 
 
       Object.keys(targetingArguments).forEach(function (varName) {
@@ -308,16 +318,16 @@ var DFPManager = Object.assign(new _events.EventEmitter().setMaxListeners(0), {
         }
       }); // set global adSense attributes
 
-      var adSenseAttributes = _this5.getAdSenseAttributes();
+      var adSenseAttributes = _this6.getAdSenseAttributes();
 
       Object.keys(adSenseAttributes).forEach(function (key) {
         pubadsService.set(key, adSenseAttributes[key]);
       });
 
-      if (_this5.lazyLoadIsEnabled()) {
+      if (_this6.lazyLoadIsEnabled()) {
         var args = [];
 
-        var config = _this5.getLazyLoadConfig();
+        var config = _this6.getLazyLoadConfig();
 
         if (config !== null) {
           args.push(config);
@@ -326,12 +336,12 @@ var DFPManager = Object.assign(new _events.EventEmitter().setMaxListeners(0), {
         pubadsService.enableLazyLoad.call(args);
       }
 
-      if (_this5.singleRequestIsEnabled()) {
+      if (_this6.singleRequestIsEnabled()) {
         pubadsService.enableSingleRequest();
       }
 
-      if (_this5.collapseEmptyDivs === true || _this5.collapseEmptyDivs === false) {
-        pubadsService.collapseEmptyDivs(_this5.collapseEmptyDivs);
+      if (_this6.collapseEmptyDivs === true || _this6.collapseEmptyDivs === false) {
+        pubadsService.collapseEmptyDivs(_this6.collapseEmptyDivs);
       }
     });
   },
@@ -373,10 +383,10 @@ var DFPManager = Object.assign(new _events.EventEmitter().setMaxListeners(0), {
     }
   },
   gptRefreshAds: function gptRefreshAds(slots) {
-    var _this6 = this;
+    var _this7 = this;
 
     return this.getGoogletag().then(function (googletag) {
-      _this6.configureOptions(googletag);
+      _this7.configureOptions(googletag);
 
       googletag.cmd.push(function () {
         var pubadsService = googletag.pubads();
@@ -387,14 +397,14 @@ var DFPManager = Object.assign(new _events.EventEmitter().setMaxListeners(0), {
     });
   },
   reload: function reload() {
-    var _this7 = this;
+    var _this8 = this;
 
     return this.destroyGPTSlots.apply(this, arguments).then(function () {
-      return _this7.load();
+      return _this8.load();
     });
   },
   destroyGPTSlots: function destroyGPTSlots() {
-    var _this8 = this;
+    var _this9 = this;
 
     for (var _len4 = arguments.length, slotsToDestroy = new Array(_len4), _key4 = 0; _key4 < _len4; _key4++) {
       slotsToDestroy[_key4] = arguments[_key4];
@@ -414,7 +424,7 @@ var DFPManager = Object.assign(new _events.EventEmitter().setMaxListeners(0), {
         slots.push(slot);
       }
 
-      _this8.getGoogletag().then(function (googletag) {
+      _this9.getGoogletag().then(function (googletag) {
         googletag.cmd.push(function () {
           if (managerAlreadyInitialized === true) {
             if (slotsToDestroy.length > 0) {
@@ -437,7 +447,7 @@ var DFPManager = Object.assign(new _events.EventEmitter().setMaxListeners(0), {
     });
   },
   registerSlot: function registerSlot(_ref) {
-    var _this9 = this;
+    var _this10 = this;
 
     var slotId = _ref.slotId,
         dfpNetworkId = _ref.dfpNetworkId,
@@ -468,7 +478,7 @@ var DFPManager = Object.assign(new _events.EventEmitter().setMaxListeners(0), {
       });
 
       if (autoLoad === true && loadPromise !== null) {
-        loadPromise = loadPromise.catch().then(function () {
+        loadPromise = loadPromise["catch"]().then(function () {
           var slot = registeredSlots[slotId];
 
           if (typeof slot !== 'undefined') {
@@ -476,7 +486,7 @@ var DFPManager = Object.assign(new _events.EventEmitter().setMaxListeners(0), {
                 gptSlot = slot.gptSlot;
 
             if (loading === false && !gptSlot) {
-              _this9.load(slotId);
+              _this10.load(slotId);
             }
           }
         });
@@ -491,6 +501,9 @@ var DFPManager = Object.assign(new _events.EventEmitter().setMaxListeners(0), {
   getRegisteredSlots: function getRegisteredSlots() {
     return registeredSlots;
   },
+  attachGPTLoadError: function attachGPTLoadError(cb) {
+    this.on('gptScriptLoadError', cb);
+  },
   attachSlotRenderEnded: function attachSlotRenderEnded(cb) {
     this.on('slotRenderEnded', cb);
   },
@@ -511,4 +524,4 @@ var DFPManager = Object.assign(new _events.EventEmitter().setMaxListeners(0), {
   }
 });
 var _default = DFPManager;
-exports.default = _default;
\ No newline at end of file
+exports["default"] = _default;
\ No newline at end of file

From 971c300185b22a46d41a91bba1780fcff3cdb632 Mon Sep 17 00:00:00 2001
From: bretthadley <brett.hadley@redbrain.com>
Date: Tue, 5 May 2020 14:01:47 +0100
Subject: [PATCH 3/8] fix lint issues

---
 js/dfpslotsprovider.js | 12 ++++++------
 js/manager.js          |  6 +++---
 2 files changed, 9 insertions(+), 9 deletions(-)

diff --git a/js/dfpslotsprovider.js b/js/dfpslotsprovider.js
index 6998941..ed19b03 100644
--- a/js/dfpslotsprovider.js
+++ b/js/dfpslotsprovider.js
@@ -51,7 +51,7 @@ export default class DFPSlotsProvider extends React.Component {
         mobileScaling: PropTypes.number,
       }),
     ]),
-    onGPTScriptLoadError: PropTypes.func
+    onGPTScriptLoadError: PropTypes.func,
   };
 
   static defaultProps = {
@@ -183,12 +183,12 @@ export default class DFPSlotsProvider extends React.Component {
   }
 
   attachGPTLoadErrorCallback() {
-    if(this.gptLoadErrorCallbackAttached === false) {
-      DFPManager.attachGPTLoadErrorCallback(function(data) {
-        if(this.props.onGPTScriptLoadError) {
-          this.props.onGPTScriptLoadError()
+    if (this.gptLoadErrorCallbackAttached === false) {
+      DFPManager.attachGPTLoadErrorCallback(function handleGPTLoadError(data) {
+        if (this.props.onGPTScriptLoadError) {
+          this.props.onGPTScriptLoadError(data);
         }
-      })
+      });
 
       this.gptLoadErrorCallbackAttached = true;
     }
diff --git a/js/manager.js b/js/manager.js
index 2d1eaab..3227e79 100644
--- a/js/manager.js
+++ b/js/manager.js
@@ -152,9 +152,9 @@ const DFPManager = Object.assign(new EventEmitter().setMaxListeners(0), {
   getGoogletag() {
     if (googleGPTScriptLoadPromise === null) {
       googleGPTScriptLoadPromise = Utils.loadGPTScript()
-      .catch((error) => {
-        this.emit('gptScriptLoadError', { error })
-      });
+        .catch((error) => {
+          this.emit('gptScriptLoadError', { error });
+        });
     }
     return googleGPTScriptLoadPromise;
   },

From 4a71e58db733656e45d2d88d6566bc5bbfcc471f Mon Sep 17 00:00:00 2001
From: bretthadley <brett.hadley@redbrain.com>
Date: Tue, 5 May 2020 15:16:03 +0100
Subject: [PATCH 4/8] typo fix

---
 js/dfpslotsprovider.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/js/dfpslotsprovider.js b/js/dfpslotsprovider.js
index ed19b03..0341c93 100644
--- a/js/dfpslotsprovider.js
+++ b/js/dfpslotsprovider.js
@@ -184,7 +184,7 @@ export default class DFPSlotsProvider extends React.Component {
 
   attachGPTLoadErrorCallback() {
     if (this.gptLoadErrorCallbackAttached === false) {
-      DFPManager.attachGPTLoadErrorCallback(function handleGPTLoadError(data) {
+      DFPManager.attachGPTLoadError(function handleGPTLoadError(data) {
         if (this.props.onGPTScriptLoadError) {
           this.props.onGPTScriptLoadError(data);
         }

From 520b1363ce8eb9b0418cbfaa13b2fec100ab64ed Mon Sep 17 00:00:00 2001
From: bretthadley <brett.hadley@redbrain.com>
Date: Tue, 5 May 2020 15:22:24 +0100
Subject: [PATCH 5/8] build

---
 lib/dfpslotsprovider.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/dfpslotsprovider.js b/lib/dfpslotsprovider.js
index bdec0bf..d2a12b9 100644
--- a/lib/dfpslotsprovider.js
+++ b/lib/dfpslotsprovider.js
@@ -181,9 +181,9 @@ var DFPSlotsProvider = /*#__PURE__*/function (_React$Component) {
     key: "attachGPTLoadErrorCallback",
     value: function attachGPTLoadErrorCallback() {
       if (this.gptLoadErrorCallbackAttached === false) {
-        _manager["default"].attachGPTLoadErrorCallback(function (data) {
+        _manager["default"].attachGPTLoadError(function handleGPTLoadError(data) {
           if (this.props.onGPTScriptLoadError) {
-            this.props.onGPTScriptLoadError();
+            this.props.onGPTScriptLoadError(data);
           }
         });
 

From 9f58eae13fc4cd8a362d2af84d87d33140b8a2c6 Mon Sep 17 00:00:00 2001
From: bretthadley <brett.hadley@redbrain.com>
Date: Tue, 5 May 2020 15:24:03 +0100
Subject: [PATCH 6/8] v0.17.4

---
 package.json | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/package.json b/package.json
index 7893a44..8735628 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
-  "name": "react-dfp",
-  "version": "0.17.2",
+  "name": "@redbrain/react-dfp",
+  "version": "0.17.4",
   "homepage": "https://github.com/jaanauati/react-dfp/",
   "author": {
     "name": "Jonatan Alexis Anauati",

From b9d9eb3353455d31ecc6b7518f6560c08ff411d2 Mon Sep 17 00:00:00 2001
From: bretthadley <brett.hadley@redbrain.com>
Date: Wed, 6 May 2020 09:15:47 +0100
Subject: [PATCH 7/8] samsung 11 issue fix.

---
 js/dfpslotsprovider.js  | 2 +-
 lib/dfpslotsprovider.js | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/js/dfpslotsprovider.js b/js/dfpslotsprovider.js
index 0341c93..19ff782 100644
--- a/js/dfpslotsprovider.js
+++ b/js/dfpslotsprovider.js
@@ -185,7 +185,7 @@ export default class DFPSlotsProvider extends React.Component {
   attachGPTLoadErrorCallback() {
     if (this.gptLoadErrorCallbackAttached === false) {
       DFPManager.attachGPTLoadError(function handleGPTLoadError(data) {
-        if (this.props.onGPTScriptLoadError) {
+        if (this.props && this.props.onGPTScriptLoadError !== undefined) {
           this.props.onGPTScriptLoadError(data);
         }
       });
diff --git a/lib/dfpslotsprovider.js b/lib/dfpslotsprovider.js
index d2a12b9..8f6892e 100644
--- a/lib/dfpslotsprovider.js
+++ b/lib/dfpslotsprovider.js
@@ -182,7 +182,7 @@ var DFPSlotsProvider = /*#__PURE__*/function (_React$Component) {
     value: function attachGPTLoadErrorCallback() {
       if (this.gptLoadErrorCallbackAttached === false) {
         _manager["default"].attachGPTLoadError(function handleGPTLoadError(data) {
-          if (this.props.onGPTScriptLoadError) {
+          if (this.props && this.props.onGPTScriptLoadError !== undefined) {
             this.props.onGPTScriptLoadError(data);
           }
         });

From e9c84e9402826913a4503fb5bb5f085a1b3819ba Mon Sep 17 00:00:00 2001
From: bretthadley <brett.hadley@redbrain.com>
Date: Wed, 6 May 2020 09:26:08 +0100
Subject: [PATCH 8/8] derp.

---
 js/dfpslotsprovider.js | 1 +
 1 file changed, 1 insertion(+)

diff --git a/js/dfpslotsprovider.js b/js/dfpslotsprovider.js
index 19ff782..acba8e6 100644
--- a/js/dfpslotsprovider.js
+++ b/js/dfpslotsprovider.js
@@ -83,6 +83,7 @@ export default class DFPSlotsProvider extends React.Component {
     this.shouldReloadConfig = this.shouldReloadConfig.bind(this);
     this.attachLoadCallback = this.attachLoadCallback.bind(this);
     this.getContextValue = this.getContextValue.bind(this);
+    this.attachGPTLoadErrorCallback = this.attachGPTLoadErrorCallback.bind(this);
     this.loadAlreadyCalled = false;
     this.loadCallbackAttached = false;
     this.gptLoadErrorCallbackAttached = false;