---- Minecraft Crash Report ----
// I'm sorry, Dave.

Time: 12/15/12 3:34 AM
Description: Ticking memory connection

java.lang.NullPointerException
	at qx.f(SourceFile:451)
	at iv.a(SourceFile:297)
	at ei.a(SourceFile:46)
	at cf.b(SourceFile:55)
	at iv.d(SourceFile:57)
	at iw.b(SourceFile:39)
	at bec.b(SourceFile:84)
	at net.minecraft.server.MinecraftServer.r(SourceFile:762)
	at net.minecraft.server.MinecraftServer.q(SourceFile:679)
	at bdz.q(SourceFile:117)
	at net.minecraft.server.MinecraftServer.run(SourceFile:613)
	at fy.run(SourceFile:849)


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

-- System Details --
Details:
	Minecraft Version: 12w50a
	Operating System: Windows 7 (amd64) version 6.1
	Java Version: 1.7.0_03, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 4658543928 bytes (4442 MB) / 5024448512 bytes (4791 MB) up to 5024448512 bytes (4791 MB)
	JVM Flags: 2 total; -Xms5000m -Xmx5000m
	AABB Pool Size: 3791 (212296 bytes; 0 MB) allocated, 3629 (203224 bytes; 0 MB) used
	Suspicious classes: No suspicious classes found.
	IntCache: cache: 0, tcache: 0, allocated: 1, tallocated: 63
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 2121 (118776 bytes; 0 MB) allocated, 2003 (112168 bytes; 0 MB) used
	Player Count: 1 / 8; [iq['setosorcerer'/251, l='12w50a test world', x=-17.93, y=64.00, z=179.00]]
	Type: Integrated Server (map_client.txt)
	Is Modded: Very likely; Jar signature invalidated