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[Daniel Letzeisen <1899700@xxxxxxxxxxxxxxxxxx>]

"AttributeError: 'NoneType' object has no attribute 'cancel'"

I think you found another way to hit this bug:
https://bugs.launchpad.net/ubuntu/+source/calibre/+bug/1898904

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https://bugs.launchpad.net/bugs/1899700

Title:
  [Regression] Does not return cover

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