Worlds not loading, instead game crashes

Put the summary of the bug you're having here

What I expected to happen was...:
What I expected to happen was when I made my new world or clicked join world the world would load.

What actually happened was...:
What actually happened was my game crashed right after loading was finished.

Steps to Reproduce:

I honestly don't know if you can reproduce it because it seems others are having an easy time loading this new snapshot but here it is anyways.

1. Click create new world or load existing world
*2. Chose settings for world
*3. Load world
4. Stare at crash screen

*Only when creating new world