Crash when finishing a resumed training session

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Acra report

D/TrainerActivity(21334): init fragments
W/FragmentActivity(21334): trueTrainerQuickFragment{48977e} (88bc2af8-c821-4f67-a86a-4a9c0a7a07a1 id=0x7f0900f0)
D/TQuickFragment(21334): showVocable
D/TrainerActivity(21334): post create
D/Trainer (21334): getSolutionUncounted
D/TQuickFragment(21334): showNextVocable(correct:true)
D/Trainer (21334): accountVocable(correct:true)
java.lang.NullPointerException: Attempt to invoke virtual method 'void vocabletrainer.heinecke.aron.vocabletrainer.lib.Database.insertEntryStat(long, vocabletrainer.heinecke.aron.vocabletrainer.lib.Storage.VEntry, boolean, boolean)' on a null object reference
    at vocabletrainer.heinecke.aron.vocabletrainer.lib.Trainer.Trainer.accountVocable(Trainer.java:329)
    at vocabletrainer.heinecke.aron.vocabletrainer.lib.Trainer.Trainer.updateVocable(Trainer.java:359)
    at vocabletrainer.heinecke.aron.vocabletrainer.fragment.TrainerQuickFragment.showNextVocable(TrainerQuickFragment.java:63)
    at vocabletrainer.heinecke.aron.vocabletrainer.fragment.TrainerQuickFragment.lambda$onCreateView$1(TrainerQuickFragment.java:50)
    at vocabletrainer.heinecke.aron.vocabletrainer.fragment.TrainerQuickFragment.$r8$lambda$C_hHhF6ZLxDXRAv5Q8p2nW7vhUc(Unknown Source:0)
    at vocabletrainer.heinecke.aron.vocabletrainer.fragment.TrainerQuickFragment$$ExternalSyntheticLambda1.onClick(Unknown Source:2)
    at android.view.View.performClick(View.java:7448)
    at com.google.android.material.button.MaterialButton.performClick(MaterialButton.java:1119)
    at android.view.View.performClickInternal(View.java:7425)
    at android.view.View.access$3600(View.java:810)
    at android.view.View$PerformClick.run(View.java:28305)
    at android.os.Handler.handleCallback(Handler.java:938)
    at android.os.Handler.dispatchMessage(Handler.java:99)
    at android.os.Looper.loop(Looper.java:223)
    at android.app.ActivityThread.main(ActivityThread.java:7664)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)

[mawoka-myblock]

Acra requires a login

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Acra requires a login

That's correct, the relevant stuff is in the issue.

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This issue is odd. For some reason the Database is null, even though it's initialized in the constructor. If somebody can tell me how they triggered this, that'd be awesome.

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I may have been able to reproduce this after a private report. It's definitely tricky to trigger and worked with

• 4x rotation
• 2x resume
• 1x locking
• 1x background Only one time.

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I was able to reproduce a different state loss, after 20 minutes of trying, it all boils down to switching the view, going into lockscreen and resume a session. I wasn't able to repeat it. Apparently it can happen that each and every state is null after this combination.. Could be related to the lifecycle changes in recent android versions.

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Easy reproduction:

• start session (1 list, 1 entry, 1 repetition, classic mode)
• solve 0 to n-1
• go back
• resume
• solve all remaining => errors shown, "ok" produced crash

Apparently the list of the entry is loosing it's "unsolved" count, leading to the default of -1, leading to isFinished always returning true, so the training doesn't end (and fails to load the next entry).

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Fixed in 0.8.1, currently on its way through the f-droid release train