Unable to destroy activity {com.carenal.app/com.carenal.app.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void androidx.lifecycle.Lifecycle.removeObserver(androidx.lifecycle.LifecycleObserver)' on a null object reference

[Add00w]

Flutter app crashes when we add gosellSDK in dependences and run the app the press back button with the following error:

error log

java.lang.RuntimeException: Unable to destroy activity {com.carenal.app/com.carenal.app.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void androidx.lifecycle.Lifecycle.removeObserver(androidx.lifecycle.LifecycleObserver)' on a null object reference
E/AndroidRuntime( 4404):    at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:4383)
E/AndroidRuntime( 4404):    at android.app.ActivityThread.handleDestroyActivity(ActivityThread.java:4401)
E/AndroidRuntime( 4404):    at android.app.ActivityThread.-wrap5(Unknown Source:0)
E/AndroidRuntime( 4404):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1649)
E/AndroidRuntime( 4404):    at android.os.Handler.dispatchMessage(Handler.java:106)
E/AndroidRuntime( 4404):    at android.os.Looper.loop(Looper.java:164)
E/AndroidRuntime( 4404):    at android.app.ActivityThread.main(ActivityThread.java:6494)
E/AndroidRuntime( 4404):    at java.lang.reflect.Method.invoke(Native Method)
E/AndroidRuntime( 4404):    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
E/AndroidRuntime( 4404):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
E/AndroidRuntime( 4404): Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void androidx.lifecycle.Lifecycle.removeObserver(androidx.lifecycle.LifecycleObserver)' on a null object reference
E/AndroidRuntime( 4404):    at tap.company.go_sell_sdk_flutter.GoSellSdkFlutterPlugin.tearDown(GoSellSdkFlutterPlugin.java:227)
E/AndroidRuntime( 4404):    at tap.company.go_sell_sdk_flutter.GoSellSdkFlutterPlugin.onDetachedFromActivity(GoSellSdkFlutterPlugin.java:175)
E/AndroidRuntime( 4404):    at io.flutter.embedding.engine.FlutterEngineConnectionRegistry.detachFromActivity(FlutterEngineConnectionRegistry.java:389)
E/AndroidRuntime( 4404):    at io.flutter.embedding.android.FlutterActivityAndFragmentDelegate.onDetach(FlutterActivityAndFragmentDelegate.java:560)
E/AndroidRuntime( 4404):    at io.flutter.embedding.android.FlutterActivity.release(FlutterActivity.java:587)
E/AndroidRuntime( 4404):    at io.flutter.embedding.android.FlutterActivity.onDestroy(FlutterActivity.java:608)
E/AndroidRuntime( 4404):    at android.app.Activity.performDestroy(Activity.java:7218)
E/AndroidRuntime( 4404):    at android.app.Instrumentation.callActivityOnDestroy(Instrumentation.java:1249)
E/AndroidRuntime( 4404):    at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:4370)

[Add00w]

Fixed with PR #26

[Add00w]

@kareem5 @tappayments @olamonir @halaq