I was playing on a map, I switched to a texturepack and the game closed.

I was playing on a map, I switched to a texturepack and the game closed.

What I expected to happen was...:
I would be able to play with my texture pack.

What actually happened was...:
The game crashed

Steps to Reproduce:
1. Go to the Nether.
2. Switch to my texture pack.
3. Watch the game crash.