---- Minecraft Crash Report ----
// This doesn't make any sense!

Time: 10/08/12 22:31
Description: Exception in server tick loop

java.lang.NullPointerException
	at gp.b(SourceFile:173)
	at gq.b(SourceFile:105)
	at net.minecraft.server.MinecraftServer.q(SourceFile:435)
	at net.minecraft.server.MinecraftServer.p(SourceFile:383)
	at axu.p(SourceFile:111)
	at net.minecraft.server.MinecraftServer.run(SourceFile:316)
	at ep.run(SourceFile:539)

Relevant Details:
- Minecraft Version: 1.3.1
- Operating System: Windows 7 (amd64) version 6.1
- Java Version: 1.6.0_31, Sun Microsystems Inc.
- Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Sun Microsystems Inc.
- Memory: 327560928 bytes (312 MB) / 996081664 bytes (949 MB) up to 996081664 bytes (949 MB)
- JVM Flags: 2 total; -Xms128m -Xmx1024m
- Type: Integrated Server
- Is Modded: Unknown (can't tell)
- Profiler Position: N/A (disabled)
- Player Count: 0 / 8; []
- World Castle W/ Bartek Entities: 0 total; []
- World Castle W/ Bartek Players: 0 total; []
- World Castle W/ Bartek Chunk Stats: ServerChunkCache: 0 Drop: 0