IssueTracker

Component used: Navigation
Version used: 1.0.0-alpha01
Devices/Android versions reproduced on: all

When using a NavHostFragment in XML that uses app:defaultNavHost="true", I'm receiving a crash on rotation when the NavHostFragment is itself within another Fragment that is dynamically added.

See the code at https://github.com/ianhanniballake/muzei/tree/navigation_main_fragment

2018-05-13 13:43:15.518 net.nurik.roman.muzei E/AndroidRuntime: FATAL EXCEPTION: main
    Process: net.nurik.roman.muzei, PID: 8029
    java.lang.RuntimeException: Unable to start activity ComponentInfo{net.nurik.roman.muzei/com.google.android.apps.muzei.MuzeiActivity}: java.lang.IllegalArgumentException: Fragment NavHostFragment{55496 #0 id=0x7f0a0056} is not an active fragment of FragmentManager FragmentManager{40ee817 in HostCallbacks{dda0404}}
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2817)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2892)
        at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:4754)
        at android.app.ActivityThread.-wrap18(Unknown Source:0)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1599)
        at android.os.Handler.dispatchMessage(Handler.java:105)
        at android.os.Looper.loop(Looper.java:164)
        at android.app.ActivityThread.main(ActivityThread.java:6541)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
     Caused by: java.lang.IllegalArgumentException: Fragment NavHostFragment{55496 #0 id=0x7f0a0056} is not an active fragment of FragmentManager FragmentManager{40ee817 in HostCallbacks{dda0404}}
        at android.support.v4.app.FragmentManagerImpl.setPrimaryNavigationFragment(FragmentManager.java:3382)
        at android.support.v4.app.BackStackRecord.executeOps(BackStackRecord.java:783)
        at android.support.v4.app.FragmentManagerImpl.executeOps(FragmentManager.java:2596)
        at android.support.v4.app.FragmentManagerImpl.executeOpsTogether(FragmentManager.java:2383)
        at android.support.v4.app.FragmentManagerImpl.removeRedundantOperationsAndExecute(FragmentManager.java:2338)
        at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:2245)
        at android.support.v4.app.FragmentManagerImpl.dispatchStateChange(FragmentManager.java:3248)
        at android.support.v4.app.FragmentManagerImpl.dispatchActivityCreated(FragmentManager.java:3200)
        at android.support.v4.app.FragmentController.dispatchActivityCreated(FragmentController.java:195)
        at android.support.v4.app.FragmentActivity.onStart(FragmentActivity.java:597)
        at android.support.v7.app.AppCompatActivity.onStart(AppCompatActivity.java:177)
        at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1333)
        at android.app.Activity.performStart(Activity.java:6992)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2780)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2892) 
        at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:4754) 
        at android.app.ActivityThread.-wrap18(Unknown Source:0) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1599) 
        at android.os.Handler.dispatchMessage(Handler.java:105) 
        at android.os.Looper.loop(Looper.java:164) 
        at android.app.ActivityThread.main(ActivityThread.java:6541) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)