IssueTracker

The removal of the nested graphs and using popUpTo the given fragment appears to prevent the crash from happening in 1.0.0-alpha11.

Project: platform/prebuilts/androidx/internal
Branch: androidx-master-dev

commit 63bc1ff1fe7c348138295ee7efb8cdc2999622c0
Author: Ian Lake <ilake@google.com>
Date:   Sun Feb 03 15:18:53 2019

    Update prebuilts for Navigation 1.0.0-beta01
   
    Include fix for b/123803044
   
    Test: ./gradlew bOS
    Change-Id: Icb2a50975541a7bd3327054c72a591c7689c9741

M       android/arch/navigation/navigation-common/1.0.0-beta01/navigation-common-1.0.0-beta01.aar
M       android/arch/navigation/navigation-common/1.0.0-beta01/navigation-common-1.0.0-beta01.aar.md5
M       android/arch/navigation/navigation-common/1.0.0-beta01/navigation-common-1.0.0-beta01.aar.sha1
M       android/arch/navigation/navigation-fragment/1.0.0-beta01/navigation-fragment-1.0.0-beta01-sources.jar
M       android/arch/navigation/navigation-fragment/1.0.0-beta01/navigation-fragment-1.0.0-beta01-sources.jar.md5
M       android/arch/navigation/navigation-fragment/1.0.0-beta01/navigation-fragment-1.0.0-beta01-sources.jar.sha1
M       android/arch/navigation/navigation-fragment/1.0.0-beta01/navigation-fragment-1.0.0-beta01.aar
M       android/arch/navigation/navigation-fragment/1.0.0-beta01/navigation-fragment-1.0.0-beta01.aar.md5
M       android/arch/navigation/navigation-fragment/1.0.0-beta01/navigation-fragment-1.0.0-beta01.aar.sha1
M       android/arch/navigation/navigation-runtime/1.0.0-beta01/navigation-runtime-1.0.0-beta01.aar
M       android/arch/navigation/navigation-runtime/1.0.0-beta01/navigation-runtime-1.0.0-beta01.aar.md5
M       android/arch/navigation/navigation-runtime/1.0.0-beta01/navigation-runtime-1.0.0-beta01.aar.sha1
M       android/arch/navigation/navigation-ui/1.0.0-beta01/navigation-ui-1.0.0-beta01.aar
M       android/arch/navigation/navigation-ui/1.0.0-beta01/navigation-ui-1.0.0-beta01.aar.md5
M       android/arch/navigation/navigation-ui/1.0.0-beta01/navigation-ui-1.0.0-beta01.aar.sha1

https://android-review.googlesource.com/892878
https://goto.google.com/android-sha1/63bc1ff1fe7c348138295ee7efb8cdc2999622c0

Project: platform/frameworks/support
Branch: androidx-master-dev

commit c775e5d1ae2ab4b194ee3c0f18523c603cf4d6ec
Author: Ian Lake <ilake@google.com>
Date:   Sun Feb 03 15:04:21 2019

    Return true when popping from FragmentNavigator
   
    Since NavController only updates its back stack when
    a Navigator returns true from popBackStack(), ensure
    that all updates to the FragmentNavigator's back stack
    (i.e., calling removeLast()) are paired with returning
    true from popBackStack().
   
    This ensures that the FragmentManager state and the
    NavController states don't get out of sync.
   
    Test: Updated FragmentNavigatorTest test
    Test: tested in sample app from bug
    BUG: 123803044
    Change-Id: I8cfc87cba0a0369b5ae5c3ac610e31b5556ba04e

M       navigation/fragment/src/androidTest/java/androidx/navigation/fragment/FragmentNavigatorTest.kt
M       navigation/fragment/src/main/java/androidx/navigation/fragment/FragmentNavigator.java

https://android-review.googlesource.com/892996
https://goto.google.com/android-sha1/c775e5d1ae2ab4b194ee3c0f18523c603cf4d6ec

This is actually an issue where the NavController's back stack state is going out of sync with the FragmentManager / FragmentNavigator's state. This has been fixed and will be available in the next release.

Nice job! A quick response!

I still get this error using the lastest 1.0.0 release :

    implementation 'android.arch.navigation:navigation-fragment-ktx:1.0.0'
    implementation "android.arch.navigation:navigation-ui-ktx:1.0.0"

I'm using nested graphs.

Re #7 - please file a new bug with a sample app that reproduces your issue.