When I load up a world in the new launcher it immediately crashes when starting to load up the game. I was using the 1.8.8 version when this happened.

Put the summary of the bug you're having here

What I expected to happen was...:
Describe what you thought should happen here
To load up my minecraft world.
What actually happened was...:
Describe what happened here
It crashed when mid loading
Steps to Reproduce:
1. Start loading a minecraft world
2. wait
3. when it is done loading it will crash