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---- Minecraft Crash Report ----
// You're mean.

Time: 3/17/13 3:56 PM
Description: Ticking entity

java.lang.ArrayIndexOutOfBoundsException
at java.lang.System.arraycopy(Native Method)
at dt.a(SourceFile:141)
at dv.<init>(SourceFile:39)
at jc.l_(SourceFile:153)
at zv.a(SourceFile:1336)
at iz.a(SourceFile:508)
at zv.g(SourceFile:1314)
at zv.h(SourceFile:1221)
at iz.h(SourceFile:390)
at net.minecraft.server.MinecraftServer.r(SourceFile:462)
at net.minecraft.server.MinecraftServer.q(SourceFile:397)
at bja.q(SourceFile:122)
at net.minecraft.server.MinecraftServer.run(SourceFile:331)
at gp.run(SourceFile:573)


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

-- Head --
Stacktrace:
at java.lang.System.arraycopy(Native Method)
at dt.a(SourceFile:141)
at dv.<init>(SourceFile:39)
at jc.l_(SourceFile:153)
at zv.a(SourceFile:1336)
at iz.a(SourceFile:508)
at zv.g(SourceFile:1314)

-- Entity being ticked --
Details:
Entity Type: null (jc)
Entity ID: 150
Entity Name: warila7
Entity's Exact location: 367.91, 10.00, 336.67
Entity's Block location: World: (367,10,336), Chunk: (at 15,0,0 in 22,21; contains blocks 352,0,336 to 367,255,351), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Entity's Momentum: 0.00, -0.08, 0.00
Stacktrace:
at zv.h(SourceFile:1221)
at iz.h(SourceFile:390)

-- Affected level --
Details:
Level name: dans underground
All players: 1 total; [jc['warila7'/150, l='dans underground', x=367.91, y=10.00, z=336.67]]
Chunk stats: ServerChunkCache: 845 Drop: 0
Level seed: -983847178
Level generator: ID 00 - default, ver 1. Features enabled: true
Level generator options:
Level spawn location: World: (200,64,244), Chunk: (at 8,4,4 in 12,15; contains blocks 192,0,240 to 207,255,255), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 283348 game time, 160248 day time
Level dimension: 0
Level storage version: 0x04ABD - Anvil
Level weather: Rain time: 144820 (now: false), thunder time: 124553 (now: false)
Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: true
Stacktrace:
at net.minecraft.server.MinecraftServer.r(SourceFile:462)
at net.minecraft.server.MinecraftServer.q(SourceFile:397)
at bja.q(SourceFile:122)
at net.minecraft.server.MinecraftServer.run(SourceFile:331)
at gp.run(SourceFile:573)

-- System Details --
Details:
Minecraft Version: 1.5
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.7.0_17, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 391091552 bytes (372 MB) / 514523136 bytes (490 MB) up to 954466304 bytes (910 MB)
JVM Flags: 2 total; -Xms512m -Xmx1024m
AABB Pool Size: 3240 (181440 bytes; 0 MB) allocated, 2251 (126056 bytes; 0 MB) used
Suspicious classes: No suspicious classes found.
IntCache: cache: 0, tcache: 0, allocated: 3, tallocated: 63
Profiler Position: N/A (disabled)
Vec3 Pool Size: 1302 (72912 bytes; 0 MB) allocated, 1034 (57904 bytes; 0 MB) used
Player Count: 1 / 8; [jc['warila7'/150, l='dans underground', x=367.91, y=10.00, z=336.67]]
Type: Integrated Server (map_client.txt)
Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.

Just checked and ya only does it in that world.