Couldn't create a world.

Put the summary of the bug you're having here

What I expected to happen was...:
I would succesfully create a world.

What actually happened was...:
Minecraft crashed, good news are: I have a coupon for a free hug!

Steps to Reproduce:
1. Load minecraft in version 1.7 or 1.7.10
2. Go to singleplayer.
3. Make any kind of new world.
4. Minecraft crashes. (Also a coupon for a free hug. )

(PS. I couldnt put 1.7 as a option in the "Affects Versions/s" place.)