Hopper: java.lang.NullPointerException

java.lang.NullPointerException
	at ays.a(SourceFile:200)
	at ayj.b(SourceFile:382)
	at ayj.a(SourceFile:259)
	at ayr.a(SourceFile:122)

---- Minecraft Crash Report ----
// Would you like a cupcake?

Time: 2013-09-27 16:07
Description: Rendering screen

java.lang.NullPointerException
	at ays.a(SourceFile:200)
	at ayj.b(SourceFile:382)
	at ayj.a(SourceFile:259)
	at ayr.a(SourceFile:122)
	at bik.b(SourceFile:847)
	at awq.aa(SourceFile:781)
	at awq.e(SourceFile:704)
	at net.minecraft.client.main.Main.main(SourceFile:104)


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

-- Head --
Stacktrace:
	at ays.a(SourceFile:200)
	at ayj.b(SourceFile:382)
	at ayj.a(SourceFile:259)
	at ayr.a(SourceFile:122)

-- Screen render details --
Details:
	Screen name: ayr
	Mouse location: Scaled: (283, 334). Absolute: (567, 37)
	Screen size: Scaled: (683, 353). Absolute: (1366, 705). Scale factor of 2
Stacktrace:
	at bik.b(SourceFile:847)
	at awq.aa(SourceFile:781)
	at awq.e(SourceFile:704)
	at net.minecraft.client.main.Main.main(SourceFile:104)

-- System Details --
Details:
	Minecraft Version: 13w39b
	Operating System: Windows 8 (x86) version 6.2
	Java Version: 1.7.0_17, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
	Memory: 52368376 bytes (49 MB) / 219258880 bytes (209 MB) up to 518979584 bytes (494 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M
	AABB Pool Size: 2291 (128296 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
	IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
	Launched Version: 13w39b
	LWJGL: 2.9.0
	OpenGL: AMD Radeon HD 7640G + 7470M Dual Graphics GL version 4.2.11764 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: English (US)
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: ~~ERROR~~ NullPointerException: null