---- Minecraft Crash Report ----
// Daisy, daisy...

Time: 2013.05.24. 13:41
Description: Sending packet

java.lang.NullPointerException
	at cj.b(SourceFile:116)
	at cj.a(SourceFile:41)
	at jm.b(SourceFile:428)
	at gz.b(SourceFile:643)
	at gz.a(SourceFile:79)
	at bie.b(SourceFile:73)
	at net.minecraft.server.MinecraftServer.s(SourceFile:491)
	at net.minecraft.server.MinecraftServer.r(SourceFile:408)
	at bib.r(SourceFile:125)
	at net.minecraft.server.MinecraftServer.run(SourceFile:342)
	at gu.run(SourceFile:585)


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

-- Head --
Stacktrace:
	at cj.b(SourceFile:116)
	at cj.a(SourceFile:41)

-- Packet being sent --
Details:
	Packet ID: 4
	Packet class: fl
Stacktrace:
	at jm.b(SourceFile:428)
	at gz.b(SourceFile:643)
	at gz.a(SourceFile:79)
	at bie.b(SourceFile:73)
	at net.minecraft.server.MinecraftServer.s(SourceFile:491)
	at net.minecraft.server.MinecraftServer.r(SourceFile:408)
	at bib.r(SourceFile:125)
	at net.minecraft.server.MinecraftServer.run(SourceFile:342)
	at gu.run(SourceFile:585)

-- System Details --
Details:
	Minecraft Version: 13w21a
	Operating System: Windows XP (x86) version 5.1
	Java Version: 1.7.0_21, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
	Memory: 181941800 bytes (173 MB) / 341045248 bytes (325 MB) up to 1037959168 bytes (989 MB)
	JVM Flags: 1 total; -Xmx1G
	AABB Pool Size: 757 (42392 bytes; 0 MB) allocated, 757 (42392 bytes; 0 MB) used
	Suspicious classes: No suspicious classes found.
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 84 (4704 bytes; 0 MB) allocated, 84 (4704 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.