[bug] Android setMicrophoneEnable produce MissingPluginException

[Pluxury]

Describe the bug
When I call

 final currentMicState = localParticipant.isMicrophoneEnabled();

 await localParticipant.setMicrophoneEnabled(!currentMicState);

I get the following error

════════ Exception caught by services library ══════════════════════════════════
The following MissingPluginException was thrown while de-activating platform stream on channel io.livekit.audio.visualizer/eventChannel-57f0c280-e5dc-4c6e-8eca-6074c9b5498a-5640a1b9-8d1d-4645-9907-9d02f00732d1:
MissingPluginException(No implementation found for method cancel on channel io.livekit.audio.visualizer/eventChannel-57f0c280-e5dc-4c6e-8eca-6074c9b5498a-5640a1b9-8d1d-4645-9907-9d02f00732d1)
When the exception was thrown, this was the stack:
#0 MethodChannel._invokeMethod (package:flutter/src/services/platform_channel.dart:365:7)
platform_channel.dart:365
#1 EventChannel.receiveBroadcastStream. (package:flutter/src/services/platform_channel.dart:727:11)
platform_channel.dart:727
═══════════════════════════════════════════════════════════════════════════════

Which in turn causes the application to crash.
Please note that this error appears only on Android. On iOS, it works as needed

UPD:
This error occurs after the call await _visualizer?.stop() in SoundWaveformWidget

client-sdk-flutter/example/lib/widgets/sound_waveform.dart

Line 87 in b0081d4

await _visualizer?.stop();

To Reproduce
You just need to connect to the room and try to mute the microphone.
This also reproduce on example project

Expected behavior
There should be no exception.

Platform information

• Flutter version: 3.38.3
• Plugin version: 2.5.4
• Flutter target OS: Android 12+ real device

[bdlukaa]

I have the same problem and it is causing a few crashes on my app.

#800

[Pluxury]

I use livekit_client version: "2.7.0" and still get this exception
@hiroshihorie I think it's worth reopen this issue.

E/MethodChannel#livekit_client(15900): Failed to handle method call
E/MethodChannel#livekit_client(15900): java.lang.IllegalStateException: MediaStreamTrack has been disposed.
E/MethodChannel#livekit_client(15900): 	at org.webrtc.MediaStreamTrack.checkMediaStreamTrackExists(MediaStreamTrack.java:120)
E/MethodChannel#livekit_client(15900): 	at org.webrtc.MediaStreamTrack.id(MediaStreamTrack.java:83)
E/MethodChannel#livekit_client(15900): 	at io.livekit.plugin.LKRemoteAudioTrack.id(LKRemoteAudioTrack.kt:34)
E/MethodChannel#livekit_client(15900): 	at io.livekit.plugin.Visualizer.<init>(Visualizer.kt:109)
E/MethodChannel#livekit_client(15900): 	at io.livekit.plugin.LiveKitPlugin.handleStartVisualizer(LiveKitPlugin.kt:76)
E/MethodChannel#livekit_client(15900): 	at io.livekit.plugin.LiveKitPlugin.onMethodCall(LiveKitPlugin.kt:216)
E/MethodChannel#livekit_client(15900): 	at io.flutter.plugin.common.MethodChannel$IncomingMethodCallHandler.onMessage(MethodChannel.java:267)
E/MethodChannel#livekit_client(15900): 	at io.flutter.embedding.engine.dart.DartMessenger.invokeHandler(DartMessenger.java:292)
E/MethodChannel#livekit_client(15900): 	at io.flutter.embedding.engine.dart.DartMessenger.lambda$dispatchMessageToQueue$0$io-flutter-embedding-engine-dart-DartMessenger(DartMessenger.java:319)
E/MethodChannel#livekit_client(15900): 	at io.flutter.embedding.engine.dart.DartMessenger$$ExternalSyntheticLambda0.run(D8$$SyntheticClass:0)
E/MethodChannel#livekit_client(15900): 	at android.os.Handler.handleCallback(Handler.java:942)
E/MethodChannel#livekit_client(15900): 	at android.os.Handler.dispatchMessage(Handler.java:99)
E/MethodChannel#livekit_client(15900): 	at android.os.Looper.loopOnce(Looper.java:201)
E/MethodChannel#livekit_client(15900): 	at android.os.Looper.loop(Looper.java:288)
E/MethodChannel#livekit_client(15900): 	at android.app.ActivityThread.main(ActivityThread.java:7924)
E/MethodChannel#livekit_client(15900): 	at java.lang.reflect.Method.invoke(Native Method)
E/MethodChannel#livekit_client(15900): 	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548)
E/MethodChannel#livekit_client(15900): 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:936)
I/flutter (15900): 2026-04-14 15:30:54.750925 [INFO] [ExLogging] livekit: startVisualizer did throw PlatformException(error, MediaStreamTrack has been disposed., null, java.lang.IllegalStateException: MediaStreamTrack has been disposed.
I/flutter (15900): 	at org.webrtc.MediaStreamTrack.checkMediaStreamTrackExists(MediaStreamTrack.java:120)
I/flutter (15900): 	at org.webrtc.MediaStreamTrack.id(MediaStreamTrack.java:83)
I/flutter (15900): 	at io.livekit.plugin.LKRemoteAudioTrack.id(LKRemoteAudioTrack.kt:34)
I/flutter (15900): 	at io.livekit.plugin.Visualizer.<init>(Visualizer.kt:109)
I/flutter (15900): 	at io.livekit.plugin.LiveKitPlugin.handleStartVisualizer(LiveKitPlugin.kt:76)
I/flutter (15900): 	at io.livekit.plugin.LiveKitPlugin.onMethodCall(LiveKitPlugin.kt:216)
I/flutter (15900): 	at io.flutter.plugin.common.MethodChannel$IncomingMethodCallHandler.onMessage(MethodChannel.java:267)
I/flutter (15900): 	at io.flutter.embedding.engine.dart.DartMessenger.invokeHandler(DartMessenger.java:292)
I/flutter (15900): 	at io.flutter.embedding.engine.dart.DartMessenger.lambda$dispatchMessageToQueue$0$io-flutter-embedding-engine-dart-DartMessenger(DartMessenger.java:319)
I/flutter (15900): 	at io.flutter.embedding.engine
I/flutter (15900): 2026-04-14 15:30:54.793479 [ERROR] FlutterError: Library: services library
I/flutter (15900): ErrorDetails:
I/flutter (15900): MissingPluginException(No implementation found for method listen on channel io.livekit.audio.visualizer/eventChannel-TR_AMb5jhLvLRxE3Y-c6fffa48-654b-451f-ae29-130ca858be87)

[bdlukaa]

I also get this exception on the latest version.