Attempt to invoke virtual method 'java.util.Set java.util.HashMap.entrySet()' on a null object reference

[Doflatango]

Environment

flutter doctor
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, v1.17.1, on Microsoft Windows [Version 10.0.19041.264], locale zh-CN)

[✓] Android toolchain - develop for Android devices (Android SDK version 28.0.3)
[✓] Android Studio (version 3.6)
[✓] VS Code (version 1.45.1)
[✓] Connected device (1 available)

• No issues found!

Flutter version: Channel stable, v1.17.1
Plugin version: 3.2.0
Android version: Oxygen OS
Device information: OnePlus 7pro

Description

Expected behavior:

Current behavior:
Attempt to invoke virtual method 'java.util.Set java.util.HashMap.entrySet()' on a null object reference

Steps to reproduce

class _HeadlessWebViewState extends State<HeadlessWebView> {
  HeadlessInAppWebView headlessInAppWebView;

  @override
  void initState() {
    super.initState();

    headlessInAppWebView = HeadlessInAppWebView(
      onWebViewCreated: (InAppWebViewController controller) {
        print('========= webview created');
      },
      initialUrl: 'https://google.com/',
      onLoadStop: (controller, url) async {
        print("========= onLoadStop $url");
      },
    );
  }

  @override
  void dispose() {
    headlessInAppWebView.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: FlatButton(
          child: Text('Run'),
          onPressed: () async {
            await headlessInAppWebView.dispose();
            await headlessInAppWebView.run();
          },
        ),
      ),
    );
  }
}

Stacktrace/Logcat

E/MethodChannel#com.pichillilorenzo/flutter_headless_inappwebview(18654): Failed to handle method call
E/MethodChannel#com.pichillilorenzo/flutter_headless_inappwebview(18654): java.lang.NullPointerException: Attempt to invoke virtual method 'java.util.Set java.util.HashMap.entrySet()' on a null object reference
E/MethodChannel#com.pichillilorenzo/flutter_headless_inappwebview(18654): 	at com.pichillilorenzo.flutter_inappwebview.InAppWebView.InAppWebViewOptions.parse(InAppWebViewOptions.java:92)
E/MethodChannel#com.pichillilorenzo/flutter_headless_inappwebview(18654): 	at com.pichillilorenzo.flutter_inappwebview.InAppWebView.FlutterWebView.<init>(FlutterWebView.java:61)
E/MethodChannel#com.pichillilorenzo/flutter_headless_inappwebview(18654): 	at com.pichillilorenzo.flutter_inappwebview.HeadlessInAppWebViewManager.createHeadlessWebView(HeadlessInAppWebViewManager.java:74)
E/MethodChannel#com.pichillilorenzo/flutter_headless_inappwebview(18654): 	at com.pichillilorenzo.flutter_inappwebview.HeadlessInAppWebViewManager.onMethodCall(HeadlessInAppWebViewManager.java:59)
E/MethodChannel#com.pichillilorenzo/flutter_headless_inappwebview(18654): 	at io.flutter.plugin.common.MethodChannel$IncomingMethodCallHandler.onMessage(MethodChannel.java:226)
E/MethodChannel#com.pichillilorenzo/flutter_headless_inappwebview(18654): 	at io.flutter.embedding.engine.dart.DartMessenger.handleMessageFromDart(DartMessenger.java:85)
E/MethodChannel#com.pichillilorenzo/flutter_headless_inappwebview(18654): 	at io.flutter.embedding.engine.FlutterJNI.handlePlatformMessage(FlutterJNI.java:631)
E/MethodChannel#com.pichillilorenzo/flutter_headless_inappwebview(18654): 	at android.os.MessageQueue.nativePollOnce(Native Method)
E/MethodChannel#com.pichillilorenzo/flutter_headless_inappwebview(18654): 	at android.os.MessageQueue.next(MessageQueue.java:336)
E/MethodChannel#com.pichillilorenzo/flutter_headless_inappwebview(18654): 	at android.os.Looper.loop(Looper.java:174)
E/MethodChannel#com.pichillilorenzo/flutter_headless_inappwebview(18654): 	at android.app.ActivityThread.main(ActivityThread.java:7695)
E/MethodChannel#com.pichillilorenzo/flutter_headless_inappwebview(18654): 	at java.lang.reflect.Method.invoke(Native Method)
E/MethodChannel#com.pichillilorenzo/flutter_headless_inappwebview(18654): 	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:516)
E/MethodChannel#com.pichillilorenzo/flutter_headless_inappwebview(18654): 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:950)

[pichillilorenzo]

New version 3.3.0 released!

[Doflatango]

It works now!
Thanks!