AudioServiceBackground.setMediaItem was called on null

[riskikukuh]

Describe the bug
_backgroundChannel is null just in function setMediaItem, other function work well. File BackgroundAudioTask in music_player/model/musicPlayerModel.dart.

Screenshots
No Screenshots for this issue.

Error messages

E/flutter ( 2489): [ERROR:flutter/lib/ui/ui_dart_state.cc(157)] Unhandled Exception: NoSuchMethodError: The method 'invokeMethod' was called on null.
E/flutter ( 2489): Receiver: null
E/flutter ( 2489): Tried calling: invokeMethod<dynamic>("setMediaItem", _LinkedHashMap len:12)
E/flutter ( 2489): #0      Object.noSuchMethod (dart:core-patch/object_patch.dart:53:5)
E/flutter ( 2489): #1      AudioServiceBackground.setMediaItem (package:audio_service/audio_service.dart:888:30)
E/flutter ( 2489): #2      MusicPlayer._skip (package:music_player/model/musicPlayerModel.dart:314:28)
E/flutter ( 2489): #3      MusicPlayer.play (package:music_player/model/musicPlayerModel.dart:129:5)
E/flutter ( 2489): <asynchronous suspension>
E/flutter ( 2489): #4      _HomepageState.build.<anonymous closure>.<anonymous closure>.<anonymous closure> (package:music_player/homePage.dart:134:26)
E/flutter ( 2489): #5      _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:706:14)
E/flutter ( 2489): #6      _InkResponseState.build.<anonymous closure> (package:flutter/src/material/ink_well.dart:789:36)
E/flutter ( 2489): #7      GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:182:24)
E/flutter ( 2489): #8      TapGestureRecognizer.handleTapUp (package:flutter/src/gestures/tap.dart:486:11)
E/flutter ( 2489): #9      BaseTapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:264:5)
E/flutter ( 2489): #10     BaseTapGestureRecognizer.acceptGesture (package:flutter/src/gestures/tap.dart:236:7)
E/flutter ( 2489): #11     GestureArenaManager.sweep (package:flutter/src/gestures/arena.dart:156:27)
E/flutter ( 2489): #12     GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:222:20)
E/flutter ( 2489): #13     GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:198:22)
E/flutter ( 2489): #14     GestureBinding._handlePointerEvent (package:flutter/src/gestures/binding.dart:156:7)
E/flutter ( 2489): #15     GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:102:7)
E/flutter ( 2489): #16     GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:86:7)
E/flutter ( 2489): #17     _rootRunUnary (dart:async/zone.dart:1138:13)
E/flutter ( 2489): #18     _CustomZone.runUnary (dart:async/zone.dart:1031:19)
E/flutter ( 2489): #19     _CustomZone.runUnaryGuarded (dart:async/zone.dart:933:7)
E/flutter ( 2489): #20     _invoke1 (dart:ui/hooks.dart:273:10)
E/flutter ( 2489): #21     _dispatchPointerDataPacket (dart:ui/hooks.dart:182:5)
E/flutter ( 2489): 

Minimal reproduction project
This my project https://github.com/riskikukuh/music_player

To Reproduce
Steps to reproduce the behavior:

1. I create file for handle state, i using provider. I make BackgroundAudioTask code and ChangeNotifier in one file, the name class is MusicPlayer.

Expected behavior
I expect _backgroundChannel was null because i merge 2 class to 1 class.

Runtime Environment (please complete the following information if relevant):

• Device: Xiaomi Redmi 3s CUSTOM ROM
• Android version: 9
• iOS version: ~

Flutter SDK version

[✓] Flutter (Channel unknown, v1.12.13+hotfix.7, on Linux, locale
    en_US.UTF-8)
 
[✓] Android toolchain - develop for Android devices (Android SDK 
    version 29.0.2)
[✓] Android Studio (version 3.5)
[✓] IntelliJ IDEA Community Edition (version 2019.2)
[✓] VS Code (version 1.41.1)
[✓] Connected device (1 available)

• No issues found!

[pro100svitlo]

Hello!
Did you figure out what was the reason?

[scullabyte]

???

[ryanheise]

This issue was closed before I had a chance to look at it and the reproduction project is no longer available.

If anyone else is experiencing a genuine bug here, please consider opening a new bug report, and provide a new minimal reproduction project along with it.

[github-actions]

This issue has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs, or use StackOverflow if you need help with audio_service.