Crashes after close playing app in foreground mode

[spy-reality]

`Fatal Exception: java.lang.RuntimeException: Unable to start service danielr2001.audioplayer.audioplayers.ForegroundAudioPlayer@67be8e6 with Intent { act=com.daniel.exoPlayer.action.pause flg=0x10000000 cmp=com.example.app/danielr2001.audioplayer.audioplayers.ForegroundAudioPlayer bnds=[564,1137][708,1281] }: java.lang.NullPointerException: Attempt to invoke virtual method 'd.a.c.a d.a.e.a.d()' on a null object reference
       at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:3698)
       at android.app.ActivityThread.access$1600(ActivityThread.java:205)
       at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1687)
       at android.os.Handler.dispatchMessage(Handler.java:106)
       at android.os.Looper.loop(Looper.java:280)
       at android.app.ActivityThread.main(ActivityThread.java:6706)
       at java.lang.reflect.Method.invoke(Method.java)
       at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)`

Caused by java.lang.NullPointerException: Attempt to invoke virtual method 'd.a.c.a d.a.e.a.d()' on a null object reference
       at danielr2001.audioplayer.audioplayers.ForegroundAudioPlayer.onStartCommand(ForegroundAudioPlayer.java:151)
       at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:3679)
       at android.app.ActivityThread.access$1600(ActivityThread.java:205)
       at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1687)
       at android.os.Handler.dispatchMessage(Handler.java:106)
       at android.os.Looper.loop(Looper.java:280)
       at android.app.ActivityThread.main(ActivityThread.java:6706)
       at java.lang.reflect.Method.invoke(Method.java)
       at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)

If close playing app in foreground mode, the app crashed and show a message "Tried to send a platform message to Flutter, but FlutterJNI was detached from native C++. Could not send. Channel: danielr2001/audioplayer. Response ID: 0"

And when start again app not play. The message "Can't start more than 1 service at a time, to stop service call release method"