The app crashes when you try to navigate out of it

[harshshinde07]

Describe the bug

The app crashes on second back press when you try to navigate away from it.

Expected Behavior

The app should successfully exit on pressing the back button second time.

Steps to reproduce it

• Open the app
• Try to close the app by pressing back button twice.

LogCat for the issue

java.lang.IllegalArgumentException: Receiver not registered: io.neurolab.main.NeuroLab$2@8bb47b1
        at android.app.LoadedApk.forgetReceiverDispatcher(LoadedApk.java:1184)
        at android.app.ContextImpl.unregisterReceiver(ContextImpl.java:1448)
        at android.content.ContextWrapper.unregisterReceiver(ContextWrapper.java:639)
        at io.neurolab.main.NeuroLab.onBackPressed(NeuroLab.java:274)
        at android.app.Activity.onKeyUp(Activity.java:2970)
        at android.view.KeyEvent.dispatch(KeyEvent.java:2751)
        at android.support.v4.view.KeyEventDispatcher.activitySuperDispatchKeyEventPre28(KeyEventDispatcher.java:137)
        at android.support.v4.view.KeyEventDispatcher.dispatchKeyEvent(KeyEventDispatcher.java:87)
        at android.support.v4.app.SupportActivity.dispatchKeyEvent(ComponentActivity.java:126)
        at android.support.v7.app.AppCompatActivity.dispatchKeyEvent(AppCompatActivity.java:535)
        at android.support.v7.view.WindowCallbackWrapper.dispatchKeyEvent(WindowCallbackWrapper.java:59)
        at android.support.v7.app.AppCompatDelegateImpl$AppCompatWindowCallback.dispatchKeyEvent(AppCompatDelegateImpl.java:2533)
        at android.support.v7.view.WindowCallbackWrapper.dispatchKeyEvent(WindowCallbackWrapper.java:59)
        at com.android.internal.policy.DecorView.dispatchKeyEvent(DecorView.java:363)
        at android.view.ViewRootImpl$ViewPostImeInputStage.processKeyEvent(ViewRootImpl.java:5244)
        at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:5110)
        at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4612)
        at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4665)
        at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4631)
        at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:4778)
        at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4639)
        at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:4835)
        at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4612)
        at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4665)
        at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4631)
        at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4639)
        at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4612)
        at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4665)
        at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4631)
        at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:4811)
        at android.view.ViewRootImpl$ImeInputStage.onFinishedInputEvent(ViewRootImpl.java:4981)
        at android.view.inputmethod.InputMethodManager$PendingEvent.run(InputMethodManager.java:2461)
        at android.view.inputmethod.InputMethodManager.invokeFinishedInputEventCallback(InputMethodManager.java:2024)
        at android.view.inputmethod.InputMethodManager.finishedInputEvent(InputMethodManager.java:2015)
        at android.view.inputmethod.InputMethodManager$ImeInputEventSender.onInputEventFinished(InputMethodManager.java:2438)
        at android.view.InputEventSender.dispatchInputEventFinished(InputEventSender.java:141)
        at android.os.MessageQueue.nativePollOnce(Native Method)
        at android.os.MessageQueue.next(MessageQueue.java:326)
        at android.os.Looper.loop(Looper.java:147)
        at android.app.ActivityThread.main(ActivityThread.java:6784)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:852)

System Information

Device	Lenovo K8 Note
Android version/OS	8.0

Would you like to work on the issue?

Yes

[harshshinde07]

I'll be working on this issue.

[jddeep]

@dipu989 @adityastic @kshitiz-kumar Can you please check whether this issue really persists now?

[adityastic]

@jddeep sure lemme check

[adityastic]

Nope, does not happen to me. @jddeep can you reproduce?

[kshitiz-kumar]

@adityastic @jddeep yes this is happening.

[adityastic]

@kshitiz-kumar great. @harshshinde07 please move ahead

[dipu989]

@jddeep @adityastic Yes, that is happening!

[kshitiz-kumar]

@harshshinde07 use a try-catch block in line number 273 of Neurolab activity. That can help !!

[dheerajkotwani]

@jddeep @adityastic same issue happened with me too. Can I work on this issue?

[harshshinde07]

@dheerajkotwani I'm working on it :)

[jddeep]

Okay, then please resolve this asap 👍