Sometimes when copying my maps for testing, I would doubleclick the world and it would show it loading, then it would close me out to the main screen. If I try re-opening it after that then Minecraft closes.
I thought it would work as normal.
Instead, it closed me out.
Steps to Reproduce:
1. Create a world and get several copies of it
2. Load one of the copies
3. If it took you back to the main screen, try reloading the world
4. You're kicked out of Minecraft
Incomplete without crash report. Please attach crash reports in the future to tickets about a crash.