Hopper: java.util.NoSuchElementException: splitter

java.util.NoSuchElementException: splitter
	at io.netty.channel.DefaultChannelPipeline.getContextOrDie(DefaultChannelPipeline.java:905)
	at io.netty.channel.DefaultChannelPipeline.addBefore(DefaultChannelPipeline.java:160)
	at io.netty.channel.DefaultChannelPipeline.addBefore(DefaultChannelPipeline.java:153)
	at ek.a(SourceFile:234)
	at bid.a(SourceFile:58)
	at ji.a(SourceFile:41)
	at ji.a(SourceFile:10)
	at ek.a(SourceFile:150)
	at bas.c(SourceFile:76)

---- Minecraft Crash Report ----
// Quite honestly, I wouldn't worry myself about that.

Time: 10/10/13 18:59
Description: Ticking screen

java.util.NoSuchElementException: splitter
	at io.netty.channel.DefaultChannelPipeline.getContextOrDie(DefaultChannelPipeline.java:905)
	at io.netty.channel.DefaultChannelPipeline.addBefore(DefaultChannelPipeline.java:160)
	at io.netty.channel.DefaultChannelPipeline.addBefore(DefaultChannelPipeline.java:153)
	at ek.a(SourceFile:234)
	at bid.a(SourceFile:58)
	at ji.a(SourceFile:41)
	at ji.a(SourceFile:10)
	at ek.a(SourceFile:150)
	at bas.c(SourceFile:76)
	at ays.o(SourceFile:1318)
	at ays.ab(SourceFile:755)
	at ays.e(SourceFile:706)
	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 io.netty.channel.DefaultChannelPipeline.getContextOrDie(DefaultChannelPipeline.java:905)
	at io.netty.channel.DefaultChannelPipeline.addBefore(DefaultChannelPipeline.java:160)
	at io.netty.channel.DefaultChannelPipeline.addBefore(DefaultChannelPipeline.java:153)
	at ek.a(SourceFile:234)
	at bid.a(SourceFile:58)
	at ji.a(SourceFile:41)
	at ji.a(SourceFile:10)
	at ek.a(SourceFile:150)
	at bas.c(SourceFile:76)

-- Affected screen --
Details:
	Screen name: bas
Stacktrace:
	at ays.o(SourceFile:1318)
	at ays.ab(SourceFile:755)
	at ays.e(SourceFile:706)
	at net.minecraft.client.main.Main.main(SourceFile:103)

-- System Details --
Details:
	Minecraft Version: 13w41a
	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: 262421528 bytes (250 MB) / 415797248 bytes (396 MB) up to 518979584 bytes (494 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M
	AABB Pool Size: 1383 (77448 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
	IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
	Launched Version: 13w41a
	LWJGL: 2.9.0
	OpenGL: ATI Mobility Radeon HD 4650 GL version 2.1.8918, 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 (UK)
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: ~~ERROR~~ NullPointerException: null