Hopper: java.lang.NullPointerException

This is an automatically generated report based from the following crash: http://hopper.minecraft.net/crashes/minecraft/MCX-145938/

Crash:

java.lang.NullPointerException
	at acs.a(SourceFile:55)
	at vb.a(SourceFile:290)
	at wz.a(SourceFile:59)
	at wy.b(SourceFile:117)
	at vx.a(SourceFile:193)
	at ku.a(SourceFile:645)
	at fm.a(SourceFile:32)
	at ea.b(SourceFile:64)
	at ku.e(SourceFile:63)

The following is the first clean report made public about this crash:

---- Minecraft Crash Report ----
// Sorry :(

Time: 13.09.13 16:29
Description: Ticking memory connection

java.lang.NullPointerException
	at acs.a(SourceFile:55)
	at vb.a(SourceFile:290)
	at wz.a(SourceFile:59)
	at wy.b(SourceFile:117)
	at vx.a(SourceFile:193)
	at ku.a(SourceFile:645)
	at fm.a(SourceFile:32)
	at ea.b(SourceFile:64)
	at ku.e(SourceFile:63)
	at kx.b(SourceFile:37)
	at boc.b(SourceFile:84)
	at net.minecraft.server.MinecraftServer.u(SourceFile:483)
	at net.minecraft.server.MinecraftServer.t(SourceFile:400)
	at bnz.t(SourceFile:124)
	at net.minecraft.server.MinecraftServer.run(SourceFile:334)
	at jb.run(SourceFile:577)


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

-- Head --
Stacktrace:
	at acs.a(SourceFile:55)
	at vb.a(SourceFile:290)
	at wz.a(SourceFile:59)
	at wy.b(SourceFile:117)
	at vx.a(SourceFile:193)
	at ku.a(SourceFile:645)
	at fm.a(SourceFile:32)
	at ea.b(SourceFile:64)
	at ku.e(SourceFile:63)

-- Ticking connection --
Details:
	Connection: ku@767ed29f
Stacktrace:
	at kx.b(SourceFile:37)
	at boc.b(SourceFile:84)
	at net.minecraft.server.MinecraftServer.u(SourceFile:483)
	at net.minecraft.server.MinecraftServer.t(SourceFile:400)
	at bnz.t(SourceFile:124)
	at net.minecraft.server.MinecraftServer.run(SourceFile:334)
	at jb.run(SourceFile:577)

-- System Details --
Details:
	Minecraft Version: 13w37b
	Operating System: Windows 7 (amd64) version 6.1
	Java Version: 1.7.0_21, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 205496208 bytes (195 MB) / 348323840 bytes (332 MB) up to 954466304 bytes (910 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
	AABB Pool Size: 6467 (362152 bytes; 0 MB) allocated, 6223 (348488 bytes; 0 MB) used
	IntCache: cache: 0, tcache: 39, allocated: 12, tallocated: 94
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 1391 (77896 bytes; 0 MB) allocated, 1083 (60648 bytes; 0 MB) used
	Player Count: 1 / 8; [kp['mrboese1000'/265, l='CASINO', x=-268,17, y=35,00, z=-292,00]]
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.

You can see this full report at http://hopper.minecraft.net/crashes/minecraft/MCX-145938/10451981/