I made flat world, with the bottom layer air, middle layer air, and top layer cake. Then I tried to enchant something, and minecraft crashed.

Put the summary of the bug you're having here
I made a flat world, I tried to enchant something, and minecraft crashed.
What I expected to happen was...:
Describe what you thought should happen here
I expected to enchant something.
What actually happened was...:
Describe what happened here
Minecraft crashed and gave me a crash report.
Steps to Reproduce:?
2. ...i dont know
3. ...i dont know