Hopper: java.lang.NullPointerException alk.b(SourceFile:50)

java.lang.NullPointerException
	at alk.b(SourceFile:50)
	at awe.h(SourceFile:75)
	at awe.A_(SourceFile:54)
	at awb.a(SourceFile:94)
	at ats.a(SourceFile:550)
	at blq.a(SourceFile:256)
	at awb.a(SourceFile:69)
	at blq.a(SourceFile:503)
	at awb.d(SourceFile:128)
	at awb.m(SourceFile:107)

---- Minecraft Crash Report ----
// My bad.

Time: 8/2/13 11:08 AM
Description: Updating screen events

java.lang.NullPointerException
	at alk.b(SourceFile:50)
	at awe.h(SourceFile:75)
	at awe.A_(SourceFile:54)
	at awb.a(SourceFile:94)
	at ats.a(SourceFile:550)
	at blq.a(SourceFile:256)
	at awb.a(SourceFile:69)
	at blq.a(SourceFile:503)
	at awb.d(SourceFile:128)
	at awb.m(SourceFile:107)
	at ats.k(SourceFile:1158)
	at ats.S(SourceFile:663)
	at ats.d(SourceFile:619)
	at net.minecraft.client.main.Main.main(SourceFile:101)


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

-- Head --
Stacktrace:
	at alk.b(SourceFile:50)
	at awe.h(SourceFile:75)
	at awe.A_(SourceFile:54)
	at awb.a(SourceFile:94)
	at ats.a(SourceFile:550)
	at blq.a(SourceFile:256)
	at awb.a(SourceFile:69)
	at blq.a(SourceFile:503)
	at awb.d(SourceFile:128)
	at awb.m(SourceFile:107)

-- Affected screen --
Details:
	Screen name: awe
Stacktrace:
	at ats.k(SourceFile:1158)
	at ats.S(SourceFile:663)
	at ats.d(SourceFile:619)
	at net.minecraft.client.main.Main.main(SourceFile:101)

-- System Details --
Details:
	Minecraft Version: 1.6.2
	Operating System: Windows 8 (x86) version 6.2
	Java Version: 1.7.0_21, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
	Memory: 34167784 bytes (32 MB) / 70873088 bytes (67 MB) up to 518979584 bytes (494 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M
	AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
	Suspicious classes: No suspicious classes found.
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	Launched Version: 1.6.2
	LWJGL: 2.9.0
	OpenGL: Intel(R) HD Graphics 2500 GL version 4.0.0 - Build 9.17.10.2849, Intel
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Pack: Default
	Current Language: English (US)
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: ~~ERROR~~ NullPointerException: null