diff --git a/package.json b/package.json
index fd10165..dc8701b 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "es6-tween",
-  "version": "5.5.6",
+  "version": "5.5.7",
   "description": "ES6 implementation of amazing tween.js",
   "browser": "bundled/Tween.min.js",
   "cdn": "bundled/Tween.min.js",
diff --git a/src/constants.js b/src/constants.js
index 9b6492f..61da124 100644
--- a/src/constants.js
+++ b/src/constants.js
@@ -59,16 +59,13 @@ const hex2rgb = (all, hex) => {
 }
 
 export function decomposeString (fromValue) {
-  if (fromValue && fromValue.splice && fromValue.isString) {
+  if (typeof fromValue !== 'string' || (fromValue && fromValue.splice && fromValue.isString)) {
     return fromValue
   }
-  const value =
-    typeof fromValue !== 'string'
-      ? fromValue
-      : fromValue
-        .replace(hexColor, hex2rgb)
-        .match(NUM_REGEX)
-        .map((v) => (isNaNForST(v) ? v : +v))
+  const value = fromValue
+    .replace(hexColor, hex2rgb)
+    .match(NUM_REGEX)
+    .map((v) => (isNaNForST(v) ? v : +v))
   value.isString = true
   return value
 }