when a minecart with hopper fall onto the void, the world crash, and never can ve opened again;

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

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

A full error report has been saved to C:\Program Files (x86)\Minecraft\data\.minecraft\crash-reports\crash-2013-01-17_14.36.05-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 69b386a7 --------
Full report at:
C:\Program Files (x86)\Minecraft\data\.minecraft\crash-reports\crash-2013-01-17_14.36.05-server.txt
Please show that file to Mojang, NOT just this screen!

Generated 17/01/13 02:36 PM

– Head –
Stacktrace:
at aar.a(SourceFile:314)
at aar.e(SourceFile:535)
at yv.r(SourceFile:1579)
at apa.b(SourceFile:290)
at apa.b(SourceFile:270)
at apa.a(SourceFile:168)
at qn.aB(SourceFile:97)
at qn.l_(SourceFile:90)
at yv.a(SourceFile:1312)
at iq.a(SourceFile:480)
at yv.g(SourceFile:1290)

– Entity being ticked –
Details:
Entity Type: MinecartHopper (qn)
Entity ID: 16033
Entity Name: entity.MinecartHopper.name
Entity's Exact location: -254,50, -2,16, -178,90
Entity's Block location: World: (-255,-3,-179), Chunk: (at 1,-1,13 in -16,-12; contains blocks -256,0,-192 to -241,255,-177), Region: (-1,-1; contains chunks -32,-32 to -1,-1, blocks -512,0,-512 to -1,255,-1)
Entity's Momentum: 0,00, -0,49, 0,06
Stacktrace:
at yv.h(SourceFile:1197)
at iq.h(SourceFile:374)

– Affected level –
Details:
Level name: crash explain world
All players: 1 total; [it['EL_GERMI_3D'/0, l='crash explain world', x=-252,58, y=4,00, z=-178,58]]
Chunk stats: ServerChunkCache: 1185 Drop: 0
Level seed: 2503259903568515599
Level generator: ID 01 - flat, ver 0. Features enabled: false
Level generator options:
Level spawn location: World: (-248,4,-176), Chunk: (at 8,0,0 in -16,-11; contains blocks -256,0,-176 to -241,255,-161), Region: (-1,-1; contains chunks -32,-32 to -1,-1, blocks -512,0,-512 to -1,255,-1)
Level time: 1867 game time, 1867 day time
Level dimension: 0
Level storage version: 0x04ABD - Anvil
Level weather: Rain time: 60079 (now: false), thunder time: 110441 (now: false)
Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true
Stacktrace:
at net.minecraft.server.MinecraftServer.r(SourceFile:460)
at net.minecraft.server.MinecraftServer.q(SourceFile:395)
at bhc.q(SourceFile:117)
at net.minecraft.server.MinecraftServer.run(SourceFile:329)
at gi.run(SourceFile:565)

– System Details –
Details:
Minecraft Version: 13w03a
Operating System: Windows 7 (x86) version 6.1
Java Version: 1.6.0_37, Sun Microsystems Inc.
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Sun Microsystems Inc.
Memory: 288499704 bytes (275 MB) / 571908096 bytes (545 MB) up to 1037959168 bytes (989 MB)
JVM Flags: 2 total; -Xms512m -Xmx1024m
AABB Pool Size: 267 (14952 bytes; 0 MB) allocated, 127 (7112 bytes; 0 MB) used
Suspicious classes: No suspicious classes found.
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
Profiler Position: N/A (disabled)
Vec3 Pool Size: 26 (1456 bytes; 0 MB) allocated, 16 (896 bytes; 0 MB) used
Player Count: 1 / 8; [it['EL_GERMI_3D'/0, l='crash explain world', x=-252,58, y=4,00, z=-178,58]]
Type: Integrated Server (map_client.txt)
Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.

java.lang.ArrayIndexOutOfBoundsException: -1
at aar.a(SourceFile:314)
at aar.e(SourceFile:535)
at yv.r(SourceFile:1579)
at apa.b(SourceFile:290)
at apa.b(SourceFile:270)
at apa.a(SourceFile:168)
at qn.aB(SourceFile:97)
at qn.l_(SourceFile:90)
at yv.a(SourceFile:1312)
at iq.a(SourceFile:480)
at yv.g(SourceFile:1290)
at yv.h(SourceFile:1197)
at iq.h(SourceFile:374)
at net.minecraft.server.MinecraftServer.r(SourceFile:460)
at net.minecraft.server.MinecraftServer.q(SourceFile:395)
at bhc.q(SourceFile:117)
at net.minecraft.server.MinecraftServer.run(SourceFile:329)
at gi.run(SourceFile:565)
— END ERROR REPORT 19319370 ----------