Crashing in a certain world (also possible all of them)

What I expected to happen was to get in the world and continue watching a walkthrough for building an FNAF 1 map (which I do not want to start over...)

What actually happened was I kept going on the world, and it kept crashing.

Steps to Reproduce:
1. Get on Minecraft
2. Go on a certain world you keep crashing on.
3. It crashes the game for some apparent reason.