---- Minecraft Crash Report ----
// Why is it breaking :(

Time: 06.12.12 21:15
Description: Exception in server tick loop

java.lang.ArrayIndexOutOfBoundsException: -1
	at aaj.b(SourceFile:42)
	at aaj.a(SourceFile:27)
	at xv.<init>(SourceFile:145)
	at in.<init>(SourceFile:70)
	at bdo.a(SourceFile:70)
	at bdo.c(SourceFile:99)
	at net.minecraft.server.MinecraftServer.run(SourceFile:595)
	at fy.run(SourceFile:856)


A detailed walkthrough of the error, its code path and all known details is as follows:
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-- System Details --
Details:
	Minecraft Version: 1.4.5
	Operating System: Windows 7 (amd64) version 6.1
	Java Version: 1.7.0_09, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 689327904 bytes (657 MB) / 936247296 bytes (892 MB) up to 954466304 bytes (910 MB)
	JVM Flags: 2 total; -Xmx1024M -Xms512M
	AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
	Suspicious classes: No suspicious classes found.
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	Profiler Position: N/A (disabled)
	Player Count: 0 / 8; []
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.