Hopper: java.lang.NullPointerException

This is an automatically generated report based from the following crash: http://hopper.minecraft.net/crashes/minecraft/MCX-145848/

Crash:

java.lang.NullPointerException
	at acs.a(SourceFile:55)
	at vb.a(SourceFile:290)
	at wz.a(SourceFile:59)
	at vx.a(SourceFile:238)
	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 ----
// Uh... Did I do that?

Time: 13.09.13 16:14
Description: Ticking memory connection

java.lang.NullPointerException
	at acs.a(SourceFile:55)
	at vb.a(SourceFile:290)
	at wz.a(SourceFile:59)
	at vx.a(SourceFile:238)
	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 vx.a(SourceFile:238)
	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@7e794b
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 (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: 78912184 bytes (75 MB) / 254574592 bytes (242 MB) up to 518979584 bytes (494 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M
	AABB Pool Size: 316 (17696 bytes; 0 MB) allocated, 232 (12992 bytes; 0 MB) used
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 111 (6216 bytes; 0 MB) allocated, 75 (4200 bytes; 0 MB) used
	Player Count: 1 / 8; [kp['Lasergurcke007'/15, l='§cHerobrine's Return §rby §bHypixel', x=-2210,50, y=48,00, z=907,89]]
	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-145848/10448042/