Hello I ve been experiencing some crashes lately when trying

Question

Hello I ve been experiencing some crashes lately when trying to pop a destination that seemingly from the pattern contains a nested navigation either a NavHost or an AnimatedNavHost It s almost like when the screen containing the navhost is popped off the stack it s attempting to recompose during the time it s being popped and throws the following exception ```java lang IllegalStateException You cannot access the NavBackStackEntry s ViewModels after the NavBackStackEntry is destroyed at androidx navigation NavBackStackEntry getViewModelStore NavBackStackEntry kt 207 at com google accompanist navigation animation AnimatedNavHostKt AnimatedNavHost AnimatedNavHost kt 144 at com google accompanist navigation animation AnimatedNavHostKt$AnimatedNavHost$11 invoke Unknown Source 23 at com google accompanist navigation animation AnimatedNavHostKt$AnimatedNavHost$11 invoke Unknown Source 10 at androidx compose runtime RecomposeScopeImpl compose RecomposeScopeImpl kt 140 at androidx compose runtime ComposerImpl recomposeToGroupEnd Composer kt 2158 at androidx compose runtime ComposerImpl skipCurrentGroup Composer kt 2404 at androidx compose runtime ComposerImpl$doCompose$2$5 invoke Composer kt 2585 at androidx compose runtime ComposerImpl$doCompose$2$5 invoke Composer kt 2571 at androidx compose runtime SnapshotStateKt DerivedStateKt observeDerivedStateRecalculations DerivedState kt 247 at androidx compose runtime SnapshotStateKt observeDerivedStateRecalculations Unknown Source 1 at androidx compose runtime ComposerImpl doCompose Composer kt 2571 at androidx compose runtime ComposerImpl recompose$runtime release Composer kt 2547 at androidx compose runtime CompositionImpl recompose Composition kt 620 at androidx compose runtime Recomposer performRecompose Recomposer kt 786 at androidx compose runtime Recomposer access$performRecompose Recomposer kt 105 ``` This is on latest 2 5 0 alpha01 but was also occurring on 2 4 0 alpha01 but with a different error message

Andrew Leung · Answer

If what I m guessing is true and the NavHost is recomposing even though its navBackStackEntry s have all been moved to the destroyed state I m not entirely sure how to workaround this issue

Andrew Leung · Answer

I ve found these bugs which all seem fairly similar to what I m experiencing I ve also seen this issue with Accompanist s Navigation material bottomSheet where if we swipe to dismiss the bottom sheet containing a destination that contains a NavHost or AnimatedNavHost the same crash occurs That is when the bottomSheet is being popped and I believe in the bottomSheet s case it uses `popWithTransition` but not entirely sure if that s the cause then the destination being popped s navhost seemingly tries to recompose which leads it to run L 144 in the AnimatedNavHost code` ```navController setViewModelStore viewModelStoreOwner viewModelStore ``` which when retrieving the viewModelStore from it s backStackEntry it has already moved to the `DESTROYED` state thus leading to the IllegalStateException

Ian Lake · Answer

If you have a repro project file a bug

Eric Chee · Answer

I too have experienced this issue I came across All stackoverflow links suggested downgrading to navigation 2 4 0 alpha07 or 5 None of which really fixed it Even tried the latest 2 5 0 alpha02 with no luck From the reddit thread it sounds like Google is choosing not to fix it which is wild Also a lot of the issues filed keep getting closed claiming their fixed with they arent

Ian Lake · Answer

No issues have ever been filed against Navigation 2 5 for this issue If you have a repro project file a bug as we d love to fix any issue you are still experiencing

Eric Chee · Answer

Sorry Ian I missed spoke The last sentence was what the reddit post was referring to Not a claim by me But yes im compiling a slimmed down sample repo to show off the issue Will file a bug

scana · Answer

hey < Andrew Leung> have you managed to resolve this

Andrew Leung · Answer

It s been awhile since I looked into this I think there was some issue on our end with respect to calling clearBackstack on the NavController We thought calling that would help us return to the top of the stack for better control but it was causing us these race conditions