java.lang.IllegalStateException: Reply already submitted

flutter.log

E/MethodChannel#flutter_tts(28553): Failed to handle method call
E/MethodChannel#flutter_tts(28553): java.lang.IllegalStateException: Reply already submitted
E/MethodChannel#flutter_tts(28553): 	at io.flutter.embedding.engine.dart.DartMessenger$Reply.reply(DartMessenger.java:435)
E/MethodChannel#flutter_tts(28553): 	at io.flutter.plugin.common.MethodChannel$IncomingMethodCallHandler$1.success(MethodChannel.java:263)
E/MethodChannel#flutter_tts(28553): 	at com.tundralabs.fluttertts.FlutterTtsPlugin.onMethodCall(FlutterTtsPlugin.kt:326)
E/MethodChannel#flutter_tts(28553): 	at io.flutter.plugin.common.MethodChannel$IncomingMethodCallHandler.onMessage(MethodChannel.java:258)
E/MethodChannel#flutter_tts(28553): 	at io.flutter.embedding.engine.dart.DartMessenger.invokeHandler(DartMessenger.java:295)
E/MethodChannel#flutter_tts(28553): 	at io.flutter.embedding.engine.dart.DartMessenger.lambda$dispatchMessageToQueue$0$io-flutter-embedding-engine-dart-DartMessenger(DartMessenger.java:322)
E/MethodChannel#flutter_tts(28553): 	at io.flutter.embedding.engine.dart.DartMessenger$$ExternalSyntheticLambda0.run(Unknown Source:12)
E/MethodChannel#flutter_tts(28553): 	at android.os.Handler.handleCallback(Handler.java:942)
E/MethodChannel#flutter_tts(28553): 	at android.os.Handler.dispatchMessage(Handler.java:99)
E/MethodChannel#flutter_tts(28553): 	at android.os.Looper.loopOnce(Looper.java:226)
E/MethodChannel#flutter_tts(28553): 	at android.os.Looper.loop(Looper.java:313)
E/MethodChannel#flutter_tts(28553): 	at android.app.ActivityThread.main(ActivityThread.java:8747)
E/MethodChannel#flutter_tts(28553): 	at java.lang.reflect.Method.invoke(Native Method)
E/MethodChannel#flutter_tts(28553): 	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:571)
E/MethodChannel#flutter_tts(28553): 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1067)
E/DartMessenger(28553): Uncaught exception in binary message listener
E/DartMessenger(28553): java.lang.IllegalStateException: Reply already submitted
E/DartMessenger(28553): 	at io.flutter.embedding.engine.dart.DartMessenger$Reply.reply(DartMessenger.java:435)
E/DartMessenger(28553): 	at io.flutter.plugin.common.MethodChannel$IncomingMethodCallHandler.onMessage(MethodChannel.java:278)
E/DartMessenger(28553): 	at io.flutter.embedding.engine.dart.DartMessenger.invokeHandler(DartMessenger.java:295)
E/DartMessenger(28553): 	at io.flutter.embedding.engine.dart.DartMessenger.lambda$dispatchMessageToQueue$0$io-flutter-embedding-engine-dart-DartMessenger(DartMessenger.java:322)
E/DartMessenger(28553): 	at io.flutter.embedding.engine.dart.DartMessenger$$ExternalSyntheticLambda0.run(Unknown Source:12)
E/DartMessenger(28553): 	at android.os.Handler.handleCallback(Handler.java:942)
E/DartMessenger(28553): 	at android.os.Handler.dispatchMessage(Handler.java:99)
E/DartMessenger(28553): 	at android.os.Looper.loopOnce(Looper.java:226)
E/DartMessenger(28553): 	at android.os.Looper.loop(Looper.java:313)
E/DartMessenger(28553): 	at android.app.ActivityThread.main(ActivityThread.java:8747)
E/DartMessenger(28553): 	at java.lang.reflect.Method.invoke(Native Method)
E/DartMessenger(28553): 	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:571)
E/DartMessenger(28553): 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1067)