Hopper: java.lang.NullPointerException bct.a(SourceFile:651)

java.lang.NullPointerException
	at bct.a(SourceFile:651)
	at bct.a(SourceFile:344)
	at ep.a(SourceFile:150)
	at cn.b(SourceFile:354)
	at bct.e(SourceFile:98)
	at bcv.c(SourceFile:71)

---- Minecraft Crash Report ----
// This doesn't make any sense!

Time: 02/08/13 18:29
Description: Ticking screen

java.lang.NullPointerException
	at bct.a(SourceFile:651)
	at bct.a(SourceFile:344)
	at ep.a(SourceFile:150)
	at cn.b(SourceFile:354)
	at bct.e(SourceFile:98)
	at bcv.c(SourceFile:71)
	at ats.k(SourceFile:1173)
	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 bct.a(SourceFile:651)
	at bct.a(SourceFile:344)
	at ep.a(SourceFile:150)
	at cn.b(SourceFile:354)
	at bct.e(SourceFile:98)
	at bcv.c(SourceFile:71)

-- Affected screen --
Details:
	Screen name: bcv
Stacktrace:
	at ats.k(SourceFile:1173)
	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 7 (amd64) version 6.1
	Java Version: 1.7.0_01, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 175742840 bytes (167 MB) / 263454720 bytes (251 MB) up to 954466304 bytes (910 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
	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: GeForce GTX 650 Ti/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 Pack: Default
	Current Language: English (US)
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: ~~ERROR~~ NullPointerException: null