Hopper: java.lang.NullPointerException

java.lang.NullPointerException
	at ayj.a(SourceFile:199)
	at aya.b(SourceFile:374)
	at aya.a(SourceFile:259)
	at ayi.a(SourceFile:122)

---- Minecraft Crash Report ----
// Why is it breaking :(

Time: 9/13/13 7:42 PM
Description: Rendering screen

java.lang.NullPointerException
	at ayj.a(SourceFile:199)
	at aya.b(SourceFile:374)
	at aya.a(SourceFile:259)
	at ayi.a(SourceFile:122)
	at bia.b(SourceFile:720)
	at awo.V(SourceFile:717)
	at awo.e(SourceFile:646)
	at net.minecraft.client.main.Main.main(SourceFile:103)


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

-- Head --
Stacktrace:
	at ayj.a(SourceFile:199)
	at aya.b(SourceFile:374)
	at aya.a(SourceFile:259)
	at ayi.a(SourceFile:122)

-- Screen render details --
Details:
	Screen name: ayi
	Mouse location: Scaled: (271, 360). Absolute: (542, 24)
	Screen size: Scaled: (683, 373). Absolute: (1366, 745). Scale factor of 2
Stacktrace:
	at bia.b(SourceFile:720)
	at awo.V(SourceFile:717)
	at awo.e(SourceFile:646)
	at net.minecraft.client.main.Main.main(SourceFile:103)

-- System Details --
Details:
	Minecraft Version: 13w37b
	Operating System: Windows 8 (amd64) version 6.2
	Java Version: 1.7.0_25, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 39521256 bytes (37 MB) / 233963520 bytes (223 MB) up to 4772200448 bytes (4551 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx5G
	AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	Launched Version: 13w37b
	LWJGL: 2.9.0
	OpenGL: GeForce GT 640M/PCIe/SSE2 GL version 4.3.0, NVIDIA Corporation
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Packs: []
	Current Language: English (US)
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: ~~ERROR~~ NullPointerException: null