IssueTracker

Component used: Fragment Version used: 1.3.3 Devices/Android versions reproduced on: Broad spectrum of devices (from Samsung, Google, LGE, TCL, Archos, and Motorola) and Android versions (6.0.1, 8.0.0, 8.1.0, 9, 10, 11)

I have not been able to reproduce this crash, so I can't attach a project in which it can be reproduced, nor screenshots. All I have to go on so far are stack traces.

For example, in this stack trace, our app has received an Intent which includes a deeplink. To handle this, we attempt to close an open Fragment before creating the new one, hence the call to popBackStackImmediate():

java.lang.NullPointerException: Attempt to invoke virtual method 'float android.view.View.getAlpha()' on a null object reference
        at androidx.fragment.app.SpecialEffectsController$Operation$State.from(SpecialEffectsController.java:409)
        at androidx.fragment.app.SpecialEffectsController.markPostponedState(SpecialEffectsController.java:236)
        at androidx.fragment.app.FragmentManager.executeOpsTogether(FragmentManager.java:2189)
        at androidx.fragment.app.FragmentManager.removeRedundantOperationsAndExecute(FragmentManager.java:2094)
        at androidx.fragment.app.FragmentManager.popBackStackImmediate(FragmentManager.java:781)
        at androidx.fragment.app.FragmentManager.popBackStackImmediate(FragmentManager.java:692)
        at com.bleacherreport.android.teamstream.utils.HomeClubhouseFragmentStateManager$ManagerInterface.popBackStackImmediate(HomeClubhouseFragmentStateManager.java:225)
        at com.bleacherreport.android.teamstream.utils.HomeClubhouseFragmentStateManager.onBackPressed(HomeClubhouseFragmentStateManager.java:107)
        at com.bleacherreport.android.teamstream.clubhouses.streams.HomeClubhouseActivity.handleIntent(HomeClubhouseActivity.java:1413)
        at com.bleacherreport.android.teamstream.clubhouses.streams.HomeClubhouseActivity.access$900(HomeClubhouseActivity.java:222)
        at com.bleacherreport.android.teamstream.clubhouses.streams.HomeClubhouseActivity$9$1.run(HomeClubhouseActivity.java:1182)
        at android.os.Handler.handleCallback(Handler.java:938)
        at android.os.Handler.dispatchMessage(Handler.java:99)
        at android.os.Looper.loop(Looper.java:246)
        at android.app.ActivityThread.main(ActivityThread.java:8506)
        at java.lang.reflect.Method.invoke(Method.java:-2)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:602)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1130)

I'm reluctant to just catch the NullPointerException, as I can see in popBackStackImmediate(@Nullable String name, int id, int flags) that we would be proceeding without these methods having been invoked, and I worry we would be in a bad state in terms of Fragment management:

updateOnBackPressedCallbackEnabled();
doPendingDeferredStart();
mFragmentStore.burpActive();

We are using: androidx.fragment:fragment:1.3.3 androidx.fragment:fragment-ktx:1.3.3