I was just creating a new world... and my minecraft crashed

Ok so I expected for my minecraft to just create a new world so I could build and stuff then it crashed. As if that has never happened to me before but once I did open a chest and my minecraft crashed though for a strange reason.
Heres the crash:

---- Minecraft Crash Report ----
// Shall we play a game?

Time: 3/27/14 6:42 AM
Description: Invalid Biome id

java.lang.NullPointerException: Invalid Biome id
	at agy.a(SourceFile:82)
	at agw.<init>(SourceFile:26)
	at agv.a(SourceFile:52)
	at agv.d(SourceFile:87)
	at agy.a(SourceFile:161)
	at agy.b(SourceFile:151)
	at apw.d(SourceFile:194)
	at mr.c(SourceFile:83)
	at mq.<init>(SourceFile:34)
	at mp.a(SourceFile:220)
	at mp.a(SourceFile:257)
	at lm.a(SourceFile:155)
	at lm.c(SourceFile:206)
	at lm.a(SourceFile:100)
	at nm.c(SourceFile:87)
	at nm.a(SourceFile:52)
	at eg.a(SourceFile:168)
	at nb.c(SourceFile:134)
	at net.minecraft.server.MinecraftServer.v(SourceFile:530)
	at net.minecraft.server.MinecraftServer.u(SourceFile:443)
	at btq.u(SourceFile:117)
	at net.minecraft.server.MinecraftServer.run(SourceFile:359)
	at lh.run(SourceFile:618)


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Head --
Stacktrace:
	at agy.a(SourceFile:82)

-- DownfallBlock --
Details:
	biome id: 0
	downfalls[] size: 256
	x: -48
	z: -80
	w: 16
	h: 16
Stacktrace:
	at agy.a(SourceFile:82)
	at agw.<init>(SourceFile:26)
	at agv.a(SourceFile:52)
	at agv.d(SourceFile:87)
	at agy.a(SourceFile:161)
	at agy.b(SourceFile:151)
	at apw.d(SourceFile:194)

-- Chunk to be generated --
Details:
	Location: -3,-5
	Position hash: -17179869187
	Generator: RandomLevelSource
Stacktrace:
	at mr.c(SourceFile:83)
	at mq.<init>(SourceFile:34)
	at mp.a(SourceFile:220)
	at mp.a(SourceFile:257)
	at lm.a(SourceFile:155)
	at lm.c(SourceFile:206)
	at lm.a(SourceFile:100)
	at nm.c(SourceFile:87)
	at nm.a(SourceFile:52)
	at eg.a(SourceFile:168)

-- Ticking connection --
Details:
	Connection: eg@7ed69cff
Stacktrace:
	at nb.c(SourceFile:134)
	at net.minecraft.server.MinecraftServer.v(SourceFile:530)
	at net.minecraft.server.MinecraftServer.u(SourceFile:443)
	at btq.u(SourceFile:117)
	at net.minecraft.server.MinecraftServer.run(SourceFile:359)
	at lh.run(SourceFile:618)

-- System Details --
Details:
	Minecraft Version: 1.7.5
	Operating System: Mac OS X (x86_64) version 10.9.2
	Java Version: 1.6.0_65, Apple Inc.
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
	Memory: 84291704 bytes (80 MB) / 182255616 bytes (173 MB) up to 1065025536 bytes (1015 MB)
	JVM Flags: 1 total; -Xmx1G
	AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
	IntCache: cache: 1, tcache: 19, allocated: 13, tallocated: 95
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
	Player Count: 1 / 8; [mv['BrandonGLau'/74, l='Endermaster Of MC Animations', x=196.50, y=64.00, z=191.50]]
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.