Stuck on an issue?

Lightrun Answers was designed to reduce the constant googling that comes with debugging 3rd party libraries. It collects links to all the places you might be looking at while hunting down a tough bug.

And, if you’re still stuck at the end, we’re happy to hop on a call to see how we can help out.

App crashes in don't keep activities mode

See original GitHub issue

There is a stable crash after such steps:

Open app
Open CreateTask screen
Hide app
Open app
Hide app

The reason is in MvpConductorLifecycleListener. When there is a controller in backstack (TasksController) method postCreateView will not be invoked. So presenter equals to null. But when you press home button it invokes postDestroy method and throws NullPointerException.

com.hannesdorfmann.mosby3.conductor.sample E/AndroidRuntime: FATAL EXCEPTION: main Process: com.hannesdorfmann.mosby3.conductor.sample, PID: 1277 java.lang.RuntimeException: Unable to destroy activity {com.hannesdorfmann.mosby3.conductor.sample/com.hannesdorfmann.mosby3.conductor.sample.MainActivity}: java.lang.NullPointerException: Presenter returned from getPresenter() is null in com.hannesdorfmann.mosby3.conductor.sample.tasks.TasksController@9221574 at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:4383) at android.app.ActivityThread.handleDestroyActivity(ActivityThread.java:4401) at android.app.ActivityThread.-wrap5(Unknown Source:0) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1649) at android.os.Handler.dispatchMessage(Handler.java:106) at android.os.Looper.loop(Looper.java:164) at android.app.ActivityThread.main(ActivityThread.java:6494) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807) Caused by: java.lang.NullPointerException: Presenter returned from getPresenter() is null in com.hannesdorfmann.mosby3.conductor.sample.tasks.TasksController@9221574 at com.hannesdorfmann.mosby3.mvp.conductor.delegate.MvpConductorLifecycleListener.postDestroy(MvpConductorLifecycleListener.java:81) at com.bluelinelabs.conductor.Controller.performDestroy(Controller.java:1076) at com.bluelinelabs.conductor.Controller.removeViewReference(Controller.java:972) at com.bluelinelabs.conductor.Controller.destroy(Controller.java:1097) at com.bluelinelabs.conductor.Controller.activityDestroyed(Controller.java:859) at com.bluelinelabs.conductor.Router.onActivityDestroyed(Router.java:558) at com.bluelinelabs.conductor.ActivityHostedRouter.onActivityDestroyed(ActivityHostedRouter.java:61) at com.bluelinelabs.conductor.internal.LifecycleHandler.destroyRouters(LifecycleHandler.java:209) at com.bluelinelabs.conductor.internal.LifecycleHandler.onDestroy(LifecycleHandler.java:160) at android.app.Fragment.performDestroy(Fragment.java:2768) at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1432) at android.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManager.java:1557) at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1618) at android.app.FragmentManagerImpl.dispatchMoveToState(FragmentManager.java:3027) at android.app.FragmentManagerImpl.dispatchDestroy(FragmentManager.java:3007) at android.app.FragmentController.dispatchDestroy(FragmentController.java:244) at android.app.Activity.performDestroy(Activity.java:7217)