Hopper: java.lang.NullPointerException 13w39b

This is an automatically generated report based from the following crash: http://hopper.minecraft.net/crashes/minecraft/MCX-247460/

Crash:

java.lang.NullPointerException
	at eb.b(SourceFile:116)
	at eb.a(SourceFile:40)

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

---- Minecraft Crash Report ----
// On the bright side, I bought you a teddy bear!

Time: 27.9.2013 15:31
Description: Sending packet

java.lang.NullPointerException
	at eb.b(SourceFile:116)
	at eb.a(SourceFile:40)
	at kv.b(SourceFile:434)
	at ln.b(SourceFile:173)
	at jh.a(SourceFile:92)
	at box.b(SourceFile:73)
	at net.minecraft.server.MinecraftServer.u(SourceFile:494)
	at net.minecraft.server.MinecraftServer.t(SourceFile:411)
	at bou.t(SourceFile:121)
	at net.minecraft.server.MinecraftServer.run(SourceFile:346)
	at jc.run(SourceFile:582)


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

-- Head --
Stacktrace:
	at eb.b(SourceFile:116)
	at eb.a(SourceFile:40)

-- Packet being sent --
Details:
	Packet ID: 200
	Packet class: fd
Stacktrace:
	at kv.b(SourceFile:434)
	at ln.b(SourceFile:173)
	at jh.a(SourceFile:92)
	at box.b(SourceFile:73)
	at net.minecraft.server.MinecraftServer.u(SourceFile:494)
	at net.minecraft.server.MinecraftServer.t(SourceFile:411)
	at bou.t(SourceFile:121)
	at net.minecraft.server.MinecraftServer.run(SourceFile:346)
	at jc.run(SourceFile:582)

-- System Details --
Details:
	Minecraft Version: 13w39b
	Operating System: Windows 8 (x86) version 6.2
	Java Version: 1.7.0_40, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
	Memory: 120532560 bytes (114 MB) / 208384000 bytes (198 MB) up to 1037959168 bytes (989 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
	AABB Pool Size: 733 (41048 bytes; 0 MB) allocated, 717 (40152 bytes; 0 MB) used
	IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 93 (5208 bytes; 0 MB) allocated, 92 (5152 bytes; 0 MB) used
	Player Count: 0 / 8; []
	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-247460/14581549/