Crash

--- BEGIN ERROR REPORT 292f3037 --------
Full report at:
C:\Users\Gabby\AppData\Roaming\.minecraft\crash-reports\crash-2013-05-20_10.13.04-server.txt
Please show that file to Mojang, NOT just this screen!

Generated 5/20/13 10:13 AM

-- Head --
Stacktrace:
	at ch.b(SourceFile:107)
	at ch.a(SourceFile:39)

-- Packet being sent --
Details:
	Packet ID: 4
	Packet class: fh
Stacktrace:
	at jh.b(SourceFile:430)
	at gu.b(SourceFile:669)
	at gu.a(SourceFile:79)
	at bjj.b(SourceFile:73)
	at net.minecraft.server.MinecraftServer.r(SourceFile:480)
	at net.minecraft.server.MinecraftServer.q(SourceFile:397)
	at bjg.q(SourceFile:122)
	at net.minecraft.server.MinecraftServer.run(SourceFile:331)
	at gp.run(SourceFile:573)

-- System Details --
Details:
	Minecraft Version: 1.5.2
	Operating System: Windows 7 (x86) version 6.1
	Java Version: 1.7.0_21, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
	Memory: 365363232 bytes (348 MB) / 922296320 bytes (879 MB) up to 1037959168 bytes (989 MB)
	JVM Flags: 2 total; -Xms512m -Xmx1024m
	AABB Pool Size: 704408 (39446848 bytes; 37 MB) allocated, 704408 (39446848 bytes; 37 MB) used
	Suspicious classes: No suspicious classes found.
	IntCache: cache: 2, tcache: 0, allocated: 1, tallocated: 63
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 87699 (4911144 bytes; 4 MB) allocated, 87699 (4911144 bytes; 4 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.

java.lang.NullPointerException
	at ch.b(SourceFile:107)
	at ch.a(SourceFile:39)
	at jh.b(SourceFile:430)
	at gu.b(SourceFile:669)
	at gu.a(SourceFile:79)
	at bjj.b(SourceFile:73)
	at net.minecraft.server.MinecraftServer.r(SourceFile:480)
	at net.minecraft.server.MinecraftServer.q(SourceFile:397)
	at bjg.q(SourceFile:122)
	at net.minecraft.server.MinecraftServer.run(SourceFile:331)
	at gp.run(SourceFile:573)
--- END ERROR REPORT d6fd0d78 ----------