diff --git a/lib/flutter_web_auth_web.dart b/lib/flutter_web_auth_web.dart
index 5f3225c..211bfb1 100644
--- a/lib/flutter_web_auth_web.dart
+++ b/lib/flutter_web_auth_web.dart
@@ -21,6 +21,9 @@ class FlutterWebAuthWeb {
       case 'authenticate':
         final String url = call.arguments['url'];
         return _authenticate(url);
+      case 'cleanUpDanglingCalls':
+        // No-op
+        break;
       default:
         throw PlatformException(
             code: 'Unimplemented',