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

Time: 30/10/12 15:42
Description: Exception in server tick loop

java.lang.ArrayIndexOutOfBoundsException: -1
	at zr.b(SourceFile:42)
	at zr.a(SourceFile:27)
	at xe.<init>(SourceFile:158)
	at ie.<init>(SourceFile:64)
	at bcb.a(SourceFile:70)
	at bcb.c(SourceFile:99)
	at net.minecraft.server.MinecraftServer.run(SourceFile:570)
	at fp.run(SourceFile:818)

Relevant Details:
- Minecraft Version: 1.4.2
- 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: 467232304 bytes (445 MB) / 514523136 bytes (490 MB) up to 1908932608 bytes (1820 MB)
- JVM Flags: 2 total; -Xms512m -Xmx2048m
- AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
- Is Modded: Probably not
- Profiler Position: N/A (disabled)
- Player Count: 0 / 8; []
- Type: Integrated Server