Hopper: java.lang.NullPointerException: Ticking memory connection

This is an automatically generated report based from the following crash: http://hopper.minecraft.net/crashes/minecraft/MCX-312428/

Crash:

java.lang.NullPointerException: Ticking memory connection
	at aeq.a(SourceFile:55)
	at wy.a(SourceFile:292)
	at yx.a(SourceFile:58)
	at xv.a(SourceFile:238)
	at mp.a(SourceFile:615)
	at ij.a(SourceFile:32)
	at ij.a(SourceFile:10)
	at ek.a(SourceFile:146)

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

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

Time: 11.10.13 18:55
Description: Ticking memory connection

java.lang.NullPointerException: Ticking memory connection
	at aeq.a(SourceFile:55)
	at wy.a(SourceFile:292)
	at yx.a(SourceFile:58)
	at xv.a(SourceFile:238)
	at mp.a(SourceFile:615)
	at ij.a(SourceFile:32)
	at ij.a(SourceFile:10)
	at ek.a(SourceFile:146)
	at ml.c(SourceFile:134)
	at net.minecraft.server.MinecraftServer.u(SourceFile:529)
	at net.minecraft.server.MinecraftServer.t(SourceFile:441)
	at brh.t(SourceFile:117)
	at net.minecraft.server.MinecraftServer.run(SourceFile:358)
	at kt.run(SourceFile:617)


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

-- Head --
Stacktrace:
	at aeq.a(SourceFile:55)
	at wy.a(SourceFile:292)
	at yx.a(SourceFile:58)
	at xv.a(SourceFile:238)
	at mp.a(SourceFile:615)
	at ij.a(SourceFile:32)
	at ij.a(SourceFile:10)
	at ek.a(SourceFile:146)

-- Ticking connection --
Details:
	Connection: ek@914a0a
Stacktrace:
	at ml.c(SourceFile:134)
	at net.minecraft.server.MinecraftServer.u(SourceFile:529)
	at net.minecraft.server.MinecraftServer.t(SourceFile:441)
	at brh.t(SourceFile:117)
	at net.minecraft.server.MinecraftServer.run(SourceFile:358)
	at kt.run(SourceFile:617)

-- System Details --
Details:
	Minecraft Version: 13w41b
	Operating System: Windows 7 (x86) version 6.1
	Java Version: 1.6.0_20, Sun Microsystems Inc.
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Sun Microsystems Inc.
	Memory: 109935744 bytes (104 MB) / 328675328 bytes (313 MB) up to 518979584 bytes (494 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M
	AABB Pool Size: 292 (16352 bytes; 0 MB) allocated, 230 (12880 bytes; 0 MB) used
	IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 42 (2352 bytes; 0 MB) allocated, 31 (1736 bytes; 0 MB) used
	Player Count: 1 / 8; [mf['Xedon1998'/17, l='Lets go', x=-404,30, y=45,00, z=877,41]]
	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-312428/16855444/