Crash when finishing a resumed training session about vocabletrainer-android HOT 7 CLOSED

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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

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