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-465385/

Crash:

java.lang.NullPointerException: Ticking memory connection
	at aez.a(SourceFile:55)
	at xh.a(SourceFile:292)
	at zg.a(SourceFile:58)
	at ye.a(SourceFile:238)
	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 ----
// Ooh. Shiny.

Time: 2013-10-25 15:29
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 ye.a(SourceFile:238)
	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 ye.a(SourceFile:238)
	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@71172d81
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: Mac OS X (x86_64) version 10.9
	Java Version: 1.6.0_65, Apple Inc.
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
	Memory: 95078696 bytes (90 MB) / 332468224 bytes (317 MB) up to 1065025536 bytes (1015 MB)
	JVM Flags: 1 total; -Xmx1G
	AABB Pool Size: 247 (13832 bytes; 0 MB) allocated, 168 (9408 bytes; 0 MB) used
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 30 (1680 bytes; 0 MB) allocated, 17 (952 bytes; 0 MB) used
	Player Count: 1 / 8; [mm['eklund011'/33, l='Graveyard Defense 2 v3.0', x=-144,84, y=58,00, z=154,36]]
	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-465385/21343912/