Latest version 5.4.2 crashes on Android - HeadlessInAppWebView.dispose

[jeromeDms]

• I have read the Get Started - Installation section
• I have read and done the Get Started - Setup Android section
• I have read and done the Get Started - Setup iOS section
• I have already searched for the same problem

Environment

Technology	Version
Flutter version	version 2.13.0-0.2.pre
Plugin version	5.4.2
Android version	9

Device information: Huawey P20 Lite physical device

Description

HeadlessInAppWebView crashes on dispose.
It seems the latest version changes some things in the dispose method, as mentioned in your logs.

Code

mainApp.dart

SingletonServer Server = SingletonServer();

class _MyHomePageState extends State<MyHomePage> with WidgetsBindingObserver {

  @override
  void dispose() {
    WidgetsBinding.instance.removeObserver(this);
    Server.disposeServerClass();
    super.dispose();
  }
}

SingletonServer.dart :

class SingletonServer {
  static final SingletonServer _singleton = SingletonServer._internal();

  factory SingletonServer() {
    return _singleton;
  }

  SingletonServer._internal();
  late FreeWebView freeWebView;
  .......

  freeWebView = FreeWebView();

void disposeServerClass() {
    freeWebView.headlessWebView?.dispose();
  }

FreeWebView.dart

class FreeWebView {
  HeadlessInAppWebView? headlessWebView;
  InAppWebViewController? webViewController;
  .....

  headlessWebView = HeadlessInAppWebView(
      initialOptions: InAppWebViewGroupOptions(
          crossPlatform: InAppWebViewOptions(
              javaScriptEnabled: true,
          ),
    ....

    // Run the webview
    await headlessWebView?.run();
    return completer.future;
}

Stacktrace/Logcat

E/AndroidRuntime(29671): FATAL EXCEPTION: main
E/AndroidRuntime(29671): Process: com.xxx.yyyy, PID: 29671
E/AndroidRuntime(29671): java.lang.RuntimeException: Unable to destroy activity {com.xxx.yyyy.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.View android.app.Activity.findViewById(int)' on a null object reference
E/AndroidRuntime(29671): 	at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:5149)
E/AndroidRuntime(29671): 	at android.app.ActivityThread.handleDestroyActivity(ActivityThread.java:5168)
E/AndroidRuntime(29671): 	at android.app.servertransaction.DestroyActivityItem.execute(DestroyActivityItem.java:39)
E/AndroidRuntime(29671): 	at android.app.servertransaction.TransactionExecutor.executeLifecycleState(TransactionExecutor.java:145)
E/AndroidRuntime(29671): 	at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:70)
E/AndroidRuntime(29671): 	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2185)
E/AndroidRuntime(29671): 	at android.os.Handler.dispatchMessage(Handler.java:112)
E/AndroidRuntime(29671): 	at android.os.Looper.loop(Looper.java:216)
E/AndroidRuntime(29671): 	at android.app.ActivityThread.main(ActivityThread.java:7593)
E/AndroidRuntime(29671): 	at java.lang.reflect.Method.invoke(Native Method)
E/AndroidRuntime(29671): 	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:524)
E/AndroidRuntime(29671): 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:987)
E/AndroidRuntime(29671): Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.View android.app.Activity.findViewById(int)' on a null object reference
E/AndroidRuntime(29671): 	at com.pichillilorenzo.flutter_inappwebview.headless_in_app_webview.HeadlessInAppWebView.dispose(Unknown Source:22)
E/AndroidRuntime(29671): 	at com.pichillilorenzo.flutter_inappwebview.headless_in_app_webview.HeadlessInAppWebViewManager.dispose(Unknown Source:28)
E/AndroidRuntime(29671): 	at com.pichillilorenzo.flutter_inappwebview.InAppWebViewFlutterPlugin.onDetachedFromEngine(Unknown Source:23)
E/AndroidRuntime(29671): 	at io.flutter.embedding.engine.FlutterEngineConnectionRegistry.remove(Unknown Source:121)
E/AndroidRuntime(29671): 	at io.flutter.embedding.engine.FlutterEngineConnectionRegistry.remove(Unknown Source:16)
E/AndroidRuntime(29671): 	at io.flutter.embedding.engine.FlutterEngineConnectionRegistry.removeAll(Unknown Source:11)
E/AndroidRuntime(29671): 	at io.flutter.embedding.engine.FlutterEngineConnectionRegistry.destroy(Unknown Source:10)
E/AndroidRuntime(29671): 	at io.flutter.embedding.engine.FlutterEngine.destroy(Unknown Source:31)
E/AndroidRuntime(29671): 	at io.flutter.embedding.android.FlutterActivityAndFragmentDelegate.onDetach(Unknown Source:98)
E/AndroidRuntime(29671): 	at io.flutter.embedding.android.FlutterFragment.onDetach(Unknown Source:7)
E/AndroidRuntime(29671): 	at androidx.fragment.app.Fragment.performDetach(Unknown Source:6)
E/AndroidRuntime(29671): 	at androidx.fragment.app.u.i(Unknown Source:33)
E/AndroidRuntime(29671): 	at androidx.fragment.app.u.m(Unknown Source:235)
E/AndroidRuntime(29671): 	at androidx.fragment.app.c0$d.c(Unknown Source:5)
E/AndroidRuntime(29671): 	at androidx.fragment.app.c0$e.b(Unknown Source:18)
E/AndroidRuntime(29671): 	at androidx.fragment.app.c0.j(Unknown Source:215)
E/AndroidRuntime(29671): 	at androidx.fragment.app.n.T(Unknown Source:36)
E/AndroidRuntime(29671): 	at androidx.fragment.app.n.F(Unknown Source:10)
E/AndroidRuntime(29671): 	at androidx.fragment.app.i.h(Unknown Source:4)
E/AndroidRuntime(29671): 	at androidx.fragment.app.e.onDestroy(Unknown Source:5)
E/AndroidRuntime(29671): 	at android.app.Activity.performDestroy(Activity.java:7737)
E/AndroidRuntime(29671): 	at android.app.Instrumentation.callActivityOnDestroy(Instrumentation.java:1327)
E/AndroidRuntime(29671): 	at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:5134)
E/AndroidRuntime(29671): 	... 11 more

[github-actions]

👋 @jeromeDms

NOTE: This comment is auto-generated.

Are you sure you have already searched for the same problem?

Some people open new issues but they didn't search for something similar or for the same issue. Please, search for it using the GitHub issue search box or on the official inappwebview.dev website, or, also, using Google, StackOverflow, etc. before posting a new one. You may already find an answer to your problem!

If this is really a new issue, then thank you for raising it. I will investigate it and get back to you as soon as possible. Please, make sure you have given me as much context as possible! Also, if you didn't already, post a code example that can replicate this issue.

In the meantime, you can already search for some possible solutions online! Because this plugin uses native WebView, you can search online for the same issue adding android WebView [MY ERROR HERE] or ios WKWebView [MY ERROR HERE] keywords.

Following these steps can save you, me, and other people a lot of time, thanks!

[isyshuai]

这也发生在我身上😢

[pichillilorenzo]

I’m working on it

[jeromeDms]

Thanks for your reactivity !

[pichillilorenzo]

Released new version 5.4.2+1 with the fix

[jeromeDms]

^5.4.2+1 seems to solve the issue.
But 5.4.3 has the same issue.
Normal ?

[github-actions]

This thread has been automatically locked since there has not been any recent activity after it was closed. If you are still experiencing a similar issue, please open a new bug and a minimal reproduction of the issue.