diff --git a/src/url_pattern.cpp b/src/url_pattern.cpp
index 2fa1f1cfb..0c1c5647d 100644
--- a/src/url_pattern.cpp
+++ b/src/url_pattern.cpp
@@ -554,6 +554,7 @@ result<std::optional<url_pattern_result>> url_pattern::match(
         base_url_string);
     // If baseURLString was given, throw a TypeError.
     if (base_url_string) {
+      ada_log("failed to match because base_url_string was given");
       return tl::unexpected(errors::type_error);
     }
 
@@ -564,8 +565,10 @@ result<std::optional<url_pattern_result>> url_pattern::match(
         std::get<url_pattern_init>(input), "url", protocol, username, password,
         hostname, port, pathname, search, hash);
 
+    // If this throws an exception, catch it, and return null.
     if (!apply_result.has_value()) {
-      return tl::unexpected(apply_result.error());
+      ada_log("match returned std::nullopt because process threw");
+      return std::nullopt;
     }
 
     // Set protocol to applyResult["protocol"].
@@ -604,7 +607,8 @@ result<std::optional<url_pattern_result>> url_pattern::match(
     auto url_input = std::get<std::string_view>(input);
     auto url = ada::parse<url_aggregator>(url_input);
     if (!url) {
-      return tl::unexpected(errors::type_error);
+      ada_log("match throw because failed to parse url_input=", url_input);
+      return std::nullopt;
     }
 
     // Let baseURL be null.
@@ -619,6 +623,7 @@ result<std::optional<url_pattern_result>> url_pattern::match(
 
       // If baseURL is failure, return null.
       if (!base_url) {
+        ada_log("match returned std::nullopt because failed to parse base_url=", *base_url_string);
         return std::nullopt;
       }
 
@@ -635,6 +640,7 @@ result<std::optional<url_pattern_result>> url_pattern::match(
 
     // If url is failure, return null.
     if (!parsed_url) {
+      ada_log("match returned std::nullopt because url failed");
       return std::nullopt;
     }
 
diff --git a/tests/wpt_urlpattern_tests.cpp b/tests/wpt_urlpattern_tests.cpp
index 9c132d56f..bdfd56766 100644
--- a/tests/wpt_urlpattern_tests.cpp
+++ b/tests/wpt_urlpattern_tests.cpp
@@ -412,13 +412,13 @@ TEST(wpt_urlpattern_tests, urlpattern_test_data) {
           base_url_view = std::string_view(base_url.value());
           opt_base_url = &base_url_view;
         }
-        if (std::holds_alternative<std::string>(init_variant)) {
-          auto str = std::get<std::string>(init_variant);
-          ada_log("init_variant is str=", str);
-          result = parse_result->exec(std::string_view(str), opt_base_url);
+        if (std::holds_alternative<std::string>(input_value)) {
+          auto str = std::get<std::string>(input_value);
+          ada_log("input_value is str=", str);
+          result = parse_result->exec(str, opt_base_url);
         } else {
-          ada_log("init_variant is url_pattern_init");
-          auto obj = std::get<ada::url_pattern_init>(init_variant);
+          ada_log("input_value is url_pattern_init");
+          auto obj = std::get<ada::url_pattern_init>(input_value);
           result = parse_result->exec(obj, opt_base_url);
         }