Hopper: java.lang.NullPointerException

java.lang.NullPointerException
	at ayn.a(SourceFile:60)
	at ayw.a(SourceFile:70)
	at ayw.d(SourceFile:139)
	at ayw.m(SourceFile:110)

---- Minecraft Crash Report ----
// Why did you do that?

Time: 13-09-06 17:23
Description: Updating screen events

java.lang.NullPointerException
	at ayn.a(SourceFile:60)
	at ayw.a(SourceFile:70)
	at ayw.d(SourceFile:139)
	at ayw.m(SourceFile:110)
	at awb.m(SourceFile:1202)
	at awb.V(SourceFile:686)
	at awb.e(SourceFile:642)
	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 ayn.a(SourceFile:60)
	at ayw.a(SourceFile:70)
	at ayw.d(SourceFile:139)
	at ayw.m(SourceFile:110)

-- Affected screen --
Details:
	Screen name: aym
Stacktrace:
	at awb.m(SourceFile:1202)
	at awb.V(SourceFile:686)
	at awb.e(SourceFile:642)
	at net.minecraft.client.main.Main.main(SourceFile:103)

-- System Details --
Details:
	Minecraft Version: 13w36b
	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, sharing), Oracle Corporation
	Memory: 3929696 bytes (3 MB) / 69566464 bytes (66 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
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	Launched Version: 13w36b
	LWJGL: 2.9.0
	OpenGL: ATI Radeon HD 2400 PRO GL version 3.3.11672 Compatibility Profile Context, ATI Technologies Inc.
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Packs: []
	Current Language: ~~ERROR~~ NullPointerException: null
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: ~~ERROR~~ NullPointerException: null