Same thing happened to me this morning, but I was in the second game of a traditional draft.
The app crashed and as soon as it logged back in I was issued with a loss.
Is there any way to revert this and let me play my league correctly?

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The same happened to me during a premier draft. Arena has been crashing a lot lately.

The same happened here, the game crashed during a draft match. I am sending the log files.

the same happened with me