---- Minecraft Crash Report ----
// I just don't know what went wrong :(

Time: 30/11/12 10:32 AM
Description: Exception in server tick loop

java.lang.NullPointerException
	at cf.b(SourceFile:103)
	at cf.a(SourceFile:35)
	at iv.b(SourceFile:437)
	at gm.a(SourceFile:72)
	at bdr.b(SourceFile:73)
	at net.minecraft.server.MinecraftServer.r(SourceFile:769)
	at net.minecraft.server.MinecraftServer.q(SourceFile:686)
	at bdo.q(SourceFile:117)
	at net.minecraft.server.MinecraftServer.run(SourceFile:620)
	at fy.run(SourceFile:856)


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

-- System Details --
Details:
	Minecraft Version: 1.4.5
	Operating System: Windows 7 (amd64) version 6.1
	Java Version: 1.6.0_24, Sun Microsystems Inc.
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Sun Microsystems Inc.
	Memory: 204146824 bytes (194 MB) / 522452992 bytes (498 MB) up to 954466304 bytes (910 MB)
	JVM Flags: 2 total; -Xms512m -Xmx1024m
	AABB Pool Size: 162868 (9120608 bytes; 8 MB) allocated, 162868 (9120608 bytes; 8 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: 128715 (7208040 bytes; 6 MB) allocated, 128715 (7208040 bytes; 6 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.