Hopper: java.lang.NullPointerException

This is an automatically generated report based from the following crash: http://hopper.minecraft.net/crashes/minecraft/MCX-198063/

Crash:

java.lang.NullPointerException
	at act.a(SourceFile:55)
	at vc.a(SourceFile:290)
	at xa.a(SourceFile:58)
	at vy.a(SourceFile:238)
	at kv.a(SourceFile:645)
	at fn.a(SourceFile:32)
	at eb.b(SourceFile:63)
	at kv.e(SourceFile:64)

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

---- Minecraft Crash Report ----
// Hey, that tickles! Hehehe!

Time: 9/20/13 3:08 PM
Description: Ticking memory connection

java.lang.NullPointerException
	at act.a(SourceFile:55)
	at vc.a(SourceFile:290)
	at xa.a(SourceFile:58)
	at vy.a(SourceFile:238)
	at kv.a(SourceFile:645)
	at fn.a(SourceFile:32)
	at eb.b(SourceFile:63)
	at kv.e(SourceFile:64)
	at ky.b(SourceFile:37)
	at bow.b(SourceFile:83)
	at net.minecraft.server.MinecraftServer.u(SourceFile:487)
	at net.minecraft.server.MinecraftServer.t(SourceFile:404)
	at bot.t(SourceFile:124)
	at net.minecraft.server.MinecraftServer.run(SourceFile:338)
	at jc.run(SourceFile:581)


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

-- Head --
Stacktrace:
	at act.a(SourceFile:55)
	at vc.a(SourceFile:290)
	at xa.a(SourceFile:58)
	at vy.a(SourceFile:238)
	at kv.a(SourceFile:645)
	at fn.a(SourceFile:32)
	at eb.b(SourceFile:63)
	at kv.e(SourceFile:64)

-- Ticking connection --
Details:
	Connection: kv@69f11d
Stacktrace:
	at ky.b(SourceFile:37)
	at bow.b(SourceFile:83)
	at net.minecraft.server.MinecraftServer.u(SourceFile:487)
	at net.minecraft.server.MinecraftServer.t(SourceFile:404)
	at bot.t(SourceFile:124)
	at net.minecraft.server.MinecraftServer.run(SourceFile:338)
	at jc.run(SourceFile:581)

-- System Details --
Details:
	Minecraft Version: 13w38c
	Operating System: Windows XP (x86) version 5.1
	Java Version: 1.7.0_25, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
	Memory: 117385928 bytes (111 MB) / 276045824 bytes (263 MB) up to 518979584 bytes (494 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M
	AABB Pool Size: 12104 (677824 bytes; 0 MB) allocated, 12054 (675024 bytes; 0 MB) used
	IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 103
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 1776 (99456 bytes; 0 MB) allocated, 1758 (98448 bytes; 0 MB) used
	Player Count: 1 / 8; [kq['nicholasowens'/701, l='Minecraft The Classic', x=-555.69, y=66.00, z=-36.70]]
	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-198063/12681031/