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I have a BIG problem, everytime I try to go to the End in my survival world my world crashes
This just happends in this world !! I can travel to the end in all my other ones, here is my crash report :



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

Minecraft has stopped running because it encountered a problem; Ticking entity

A full error report has been saved to C:\Documents and Settings\Juan Carlos\Application Data\.minecraft\crash-reports\crash-2012-11-15_13.47.15-server.txt - Please include a copy of that file (Not this screen!) if you report this crash to anyone; without it, they will not be able to help fix the crash



--- BEGIN ERROR REPORT fb0f395c --------
Full report at:
C:\Documents and Settings\Juan Carlos\Application Data\.minecraft\crash-reports\crash-2012-11-15_13.47.15-server.txt
Please show that file to Mojang, NOT just this screen!

Generated 15/11/12 01:47 PM

-- Head --
Stacktrace:
at ii.a(SourceFile:72)
at ii.a(SourceFile:50)
at ij.a(SourceFile:24)
at xv.a(SourceFile:842)
at in.a(SourceFile:581)
at xv.d(SourceFile:834)
at gm.a(SourceFile:369)
at lq.b(SourceFile:1492)
at px.b(SourceFile:201)
at amg.a(SourceFile:62)
at lq.D(SourceFile:652)
at lq.d(SourceFile:615)
at px.j_(SourceFile:67)
at xv.a(SourceFile:1317)
at in.a(SourceFile:451)
at xv.g(SourceFile:1296)


-- Entity being ticked --
Details:
Entity Type: Item (px)
Entity ID: 598
Name: item.tile.whiteStone
Exact location: 100.00, 50.13, 0.00
Block location: World: (100,50,0), Chunk: (at 4,3,0 in 6,0; contains blocks 96,0,0 to 111,255,15), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Momentum: 0.00, 0.00, 0.00
Stacktrace:
at xv.h(SourceFile:1195)
at in.h(SourceFile:363)

-- Affected level --
Details:
Level name: Original
All players: 1 total; [iq['Player'/75, l='Original', x=100.00, y=49.00, z=0.00]]
Chunk stats: ServerChunkCache: 442 Drop: 0
Level seed: 8984063354714742917
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (0,0,0), Chunk: (at 0,0,0 in 0,0; contains blocks 0,0,0 to 15,255,15), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 0 game time, 0 day time
Level dimension: 0
Level storage version: 0x00000 - Unknown?
Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
Level game mode: ~~ERROR~~ NullPointerException: null
Stacktrace:
at net.minecraft.server.MinecraftServer.r(SourceFile:751)
at net.minecraft.server.MinecraftServer.q(SourceFile:686)
at bdo.q(SourceFile:117)
at net.minecraft.server.MinecraftServer.run(SourceFile:620)
at fy.run(SourceFile:856)

-- System Details --
Details:
Minecraft Version: 1.4.4
Operating System: Windows XP (x86) version 5.1
Java Version: 1.7.0_09, Oracle Corporation
Java VM Version: Java HotSpot™ Client VM (mixed mode), Oracle Corporation
Memory: 289774632 bytes (276 MB) / 519110656 bytes (495 MB) up to 1037959168 bytes (989 MB)
JVM Flags: 2 total; -Xms512m -Xmx1024m
AABB Pool Size: 3774 (211344 bytes; 0 MB) allocated, 2024 (113344 bytes; 0 MB) used
Suspicious classes: No suspicious classes found.
IntCache: cache: 2, tcache: 0, allocated: 1, tallocated: 63
Profiler Position: N/A (disabled)
Vec3 Pool Size: 1874 (104944 bytes; 0 MB) allocated, 1250 (70000 bytes; 0 MB) used
Player Count: 1 / 8; [iq['Player'/75, l='Original', x=100.00, y=49.00, z=0.00]]
Type: Integrated Server (map_client.txt)
Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.

java.lang.IllegalStateException: Entity is already tracked!
at ii.a(SourceFile:72)
at ii.a(SourceFile:50)
at ij.a(SourceFile:24)
at xv.a(SourceFile:842)
at in.a(SourceFile:581)
at xv.d(SourceFile:834)
at gm.a(SourceFile:369)
at lq.b(SourceFile:1492)
at px.b(SourceFile:201)
at amg.a(SourceFile:62)
at lq.D(SourceFile:652)
at lq.d(SourceFile:615)
at px.j_(SourceFile:67)
at xv.a(SourceFile:1317)
at in.a(SourceFile:451)
at xv.g(SourceFile:1296)
at xv.h(SourceFile:1195)
at in.h(SourceFile:363)
at net.minecraft.server.MinecraftServer.r(SourceFile:751)
at net.minecraft.server.MinecraftServer.q(SourceFile:686)
at bdo.q(SourceFile:117)
at net.minecraft.server.MinecraftServer.run(SourceFile:620)
at fy.run(SourceFile:856)
--- END ERROR REPORT 2e3f7bff ----------

What is wrong??