Crash when loading new world or any terrain

Minecraft was working perfectly fine until I created a new world. The game crashed (not because of a lack of memory) but because I was loading a biome And now I am unable to load any terrain. My drivers are updated, so I don't know how to fix this. Here's the report.
Time: 12/28/13 6:06 PM
Description: Getting biome

java.lang.NullPointerException: Getting biome
at aoo.a(SourceFile:934)
at afs.a(SourceFile:116)
at agi.a(SourceFile:158)
at ajy.d(SourceFile:76)
at bmf.q(SourceFile:3871)
at bmf.b(SourceFile:134)
at bmh.a(SourceFile:163)
at bmt.a(SourceFile:1263)
at bmm.a(SourceFile:958)
at bmm.b(SourceFile:816)
at azi.ah(SourceFile:787)
at azi.f(SourceFile:711)
at net.minecraft.client.main.Main.main(SourceFile:152)