java.lang.IllegalStateException. Any ideas?

[zuevval]

https://play.google.com/console/u/1/developers/6339580535455997235/app/4972044253482148709/vitals/crashes/12080487/details?installedFrom=PLAY_STORE&days=30

java.lang.IllegalStateException: 
  at androidx.fragment.app.Fragment.getParentFragmentManager (Fragment.java:945)
  at androidx.navigation.fragment.NavHostFragment.findNavController (NavHostFragment.java:107)
  at androidx.navigation.fragment.FragmentKt.findNavController (Fragment.kt:29)
  at com.github.braillesystems.learnbraille.utils._AndroidKt.navigate (_Android.kt:98)
  at com.github.braillesystems.learnbraille.ui.screens.theory.TheoryFreeNavigationKt.toStep (TheoryFreeNavigation.kt:42)
  at com.github.braillesystems.learnbraille.ui.screens.theory.TheoryFreeNavigationKt$toNextStep$2.invokeSuspend (TheoryFreeNavigation.kt:54)
  at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith (ContinuationImpl.kt:33)
  at kotlinx.coroutines.DispatchedTask.run (Dispatched.kt:241)
  at android.os.Handler.handleCallback (Handler.java:883)
  at android.os.Handler.dispatchMessage (Handler.java:100)
  at android.os.Looper.loop (Looper.java:237)
  at android.app.ActivityThread.main (ActivityThread.java:7814)
  at java.lang.reflect.Method.invoke (Native Method)
  at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run (RuntimeInit.java:493)
  at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:1075)

[zuevval]

one more 8 hours ago

java.lang.IllegalStateException: 
  at androidx.fragment.app.Fragment.getParentFragmentManager (Fragment.java:945)
  at androidx.navigation.fragment.NavHostFragment.findNavController (NavHostFragment.java:107)
  at androidx.navigation.fragment.FragmentKt.findNavController (Fragment.kt:29)
  at com.github.braillesystems.learnbraille.utils._AndroidKt.navigate (_Android.kt:95)
  at com.github.braillesystems.learnbraille.ui.screens.theory.TheoryFreeNavigationKt.toStep (TheoryFreeNavigation.kt:40)
  at com.github.braillesystems.learnbraille.ui.screens.theory.TheoryFreeNavigationKt$toPrevStep$1.invokeSuspend (TheoryFreeNavigation.kt:66)
  at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith (ContinuationImpl.kt:33)
  at kotlinx.coroutines.DispatchedTask.run (Dispatched.kt:241)
  at android.os.Handler.handleCallback (Handler.java:907)
  at android.os.Handler.dispatchMessage (Handler.java:105)
  at android.os.Looper.loop (Looper.java:216)
  at android.app.ActivityThread.main (ActivityThread.java:7625)
  at java.lang.reflect.Method.invoke (Native Method)
  at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run (RuntimeInit.java:524)
  at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:987)

[zuevval]

Android 8, 9, 10