bug

Minecraft has crashed!      
      ----------------------      

Minecraft has stopped running because it encountered a problem; Exception in server tick loop
This error has been saved to C:\Documents and Settings\STaSA\Data aplikací\.minecraft\crash-reports\crash-2012-11-07_19.40.58-server.txt for your convenience. Please include a copy of this file if you report this crash to anyone.



--- BEGIN ERROR REPORT 2b32a946 --------
Generated 7.11.12 19:41

- Minecraft Version: 1.4.2
- Operating System: Windows XP (x86) version 5.1
- Java Version: 1.6.0_15, Sun Microsystems Inc.
- Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Sun Microsystems Inc.
- Memory: 214335152 bytes (204 MB) / 532807680 bytes (508 MB) up to 1065484288 bytes (1016 MB)
- JVM Flags: 2 total; -Xms512m -Xmx1024m
- AABB Pool Size: 529798 (29668688 bytes; 28 MB) allocated, 529798 (29668688 bytes; 28 MB) used
- Is Modded: Very likely
- Profiler Position: N/A (disabled)
- Vec3 Pool Size: 19445 (1088920 bytes; 1 MB) allocated, 19445 (1088920 bytes; 1 MB) used
- Player Count: 0 / 8; []
- World westminster Entities: 0 total; []
- World westminster Players: 0 total; []
- World westminster Chunk Stats: ServerChunkCache: 4 Drop: 0
- Type: Integrated Server

java.lang.NullPointerException
	at bw.b(SourceFile:103)
	at bw.a(SourceFile:35)
	at im.b(SourceFile:457)
	at ge.a(SourceFile:73)
	at bce.b(SourceFile:72)
	at net.minecraft.server.MinecraftServer.r(SourceFile:731)
	at net.minecraft.server.MinecraftServer.q(SourceFile:661)
	at bcb.q(SourceFile:117)
	at net.minecraft.server.MinecraftServer.run(SourceFile:595)
	at fp.run(SourceFile:818)
--- END ERROR REPORT 1649ff7f ----------