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-465309/

Crash:

java.lang.NullPointerException: Ticking memory connection
	at aez.a(SourceFile:55)
	at xh.a(SourceFile:292)
	at zg.a(SourceFile:58)
	at zf.b(SourceFile:117)
	at ye.a(SourceFile:193)
	at mx.a(SourceFile:623)
	at il.a(SourceFile:32)
	at il.a(SourceFile:10)
	at ef.a(SourceFile:164)

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

---- Minecraft Crash Report ----
// Don't be sad, have a hug! <3

Time: 25.10.13 16:45
Description: Ticking memory connection

java.lang.NullPointerException: Ticking memory connection
	at aez.a(SourceFile:55)
	at xh.a(SourceFile:292)
	at zg.a(SourceFile:58)
	at zf.b(SourceFile:117)
	at ye.a(SourceFile:193)
	at mx.a(SourceFile:623)
	at il.a(SourceFile:32)
	at il.a(SourceFile:10)
	at ef.a(SourceFile:164)
	at ms.c(SourceFile:134)
	at net.minecraft.server.MinecraftServer.u(SourceFile:529)
	at net.minecraft.server.MinecraftServer.t(SourceFile:441)
	at bsk.t(SourceFile:117)
	at net.minecraft.server.MinecraftServer.run(SourceFile:358)
	at ky.run(SourceFile:617)


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

-- Head --
Stacktrace:
	at aez.a(SourceFile:55)
	at xh.a(SourceFile:292)
	at zg.a(SourceFile:58)
	at zf.b(SourceFile:117)
	at ye.a(SourceFile:193)
	at mx.a(SourceFile:623)
	at il.a(SourceFile:32)
	at il.a(SourceFile:10)
	at ef.a(SourceFile:164)

-- Ticking connection --
Details:
	Connection: ef@272b1a
Stacktrace:
	at ms.c(SourceFile:134)
	at net.minecraft.server.MinecraftServer.u(SourceFile:529)
	at net.minecraft.server.MinecraftServer.t(SourceFile:441)
	at bsk.t(SourceFile:117)
	at net.minecraft.server.MinecraftServer.run(SourceFile:358)
	at ky.run(SourceFile:617)

-- System Details --
Details:
	Minecraft Version: 1.7.2
	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: 31934208 bytes (30 MB) / 144666624 bytes (137 MB) up to 518979584 bytes (494 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M
	AABB Pool Size: 1492 (83552 bytes; 0 MB) allocated, 1280 (71680 bytes; 0 MB) used
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 372 (20832 bytes; 0 MB) allocated, 286 (16016 bytes; 0 MB) used
	Player Count: 1 / 8; [mm['aloren123'/9, l='§f§o§lMultiplex 2: §2§l§oThe Village', x=141,28, y=68,00, z=-182,70]]
	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-465309/21349262/