Hopper: java.lang.NullPointerException

This is an automatically generated report based from the following crash: http://hopper.minecraft.net/crashes/minecraft/MCX-196494/

Crash:

java.lang.NullPointerException
	at afm.a(SourceFile:57)
	at afk.a(SourceFile:423)
	at ade.d(SourceFile:309)
	at akx.a(SourceFile:411)
	at akx.a(SourceFile:500)
	at akj.a(SourceFile:1017)
	at akz.a(SourceFile:37)
	at akr.a(SourceFile:88)
	at agn.a(SourceFile:401)
	at km.a(SourceFile:156)
	at afk.a(SourceFile:778)
	at km.c(SourceFile:93)
	at kl.<init>(SourceFile:28)
	at kk.a(SourceFile:209)
	at kk.d(SourceFile:343)
	at jh.d(SourceFile:211)
	at kv.a(SourceFile:270)
	at gn.a(SourceFile:136)
	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 ----
// Quite honestly, I wouldn't worry myself about that.

Time: 20.09.13 17:21
Description: Ticking memory connection

java.lang.NullPointerException
	at afm.a(SourceFile:57)
	at afk.a(SourceFile:423)
	at ade.d(SourceFile:309)
	at akx.a(SourceFile:411)
	at akx.a(SourceFile:500)
	at akj.a(SourceFile:1017)
	at akz.a(SourceFile:37)
	at akr.a(SourceFile:88)
	at agn.a(SourceFile:401)
	at km.a(SourceFile:156)
	at afk.a(SourceFile:778)
	at km.c(SourceFile:93)
	at kl.<init>(SourceFile:28)
	at kk.a(SourceFile:209)
	at kk.d(SourceFile:343)
	at jh.d(SourceFile:211)
	at kv.a(SourceFile:270)
	at gn.a(SourceFile:136)
	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 afm.a(SourceFile:57)
	at afk.a(SourceFile:423)
	at ade.d(SourceFile:309)
	at akx.a(SourceFile:411)
	at akx.a(SourceFile:500)
	at akj.a(SourceFile:1017)
	at akz.a(SourceFile:37)
	at akr.a(SourceFile:88)
	at agn.a(SourceFile:401)
	at km.a(SourceFile:156)
	at afk.a(SourceFile:778)
	at km.c(SourceFile:93)
	at kl.<init>(SourceFile:28)
	at kk.a(SourceFile:209)
	at kk.d(SourceFile:343)
	at jh.d(SourceFile:211)
	at kv.a(SourceFile:270)
	at gn.a(SourceFile:136)
	at eb.b(SourceFile:63)
	at kv.e(SourceFile:64)

-- Ticking connection --
Details:
	Connection: kv@72932634
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: 13w38b
	Operating System: Windows 7 (amd64) version 6.1
	Java Version: 1.7.0_17, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 176672720 bytes (168 MB) / 420610048 bytes (401 MB) up to 954466304 bytes (910 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
	AABB Pool Size: 4359 (244104 bytes; 0 MB) allocated, 3762 (210672 bytes; 0 MB) used
	IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 2300 (128800 bytes; 0 MB) allocated, 1762 (98672 bytes; 0 MB) used
	Player Count: 1 / 8; [kq['babuun'/24473, l='New World', x=704,37, y=86,25, z=798,00]]
	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-196494/12598969/