Crash

Minecraft Crash Report ----
// Surprise! Haha. Well, this is awkward.

Time: 12-11-13 19:30
Description: Ticking screen

java.lang.NullPointerException
at bct.a(SourceFile:671)
at fg.a(SourceFile:28)
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:671)
at fg.a(SourceFile:28)
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 (x86) version 6.1
Java Version: 1.7.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 53485664 bytes (51 MB) / 111906816 bytes (106 MB) up to 1037959168 bytes (989 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 8200M G/PCI/SSE2 GL version 3.2.0, NVIDIA Corporation
Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Resource Pack: Default
Current Language: Nederlands (Nederland)
Profiler Position: N/A (disabled)
Vec3 Pool Size: ~_ERROR~ NullPointerException: null