When anvil falls on flowing water on edge of a block it crashes the game

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

Minecraft has stopped running because it encountered a problem; Rendering entity in world

A full error report has been saved to C:\Users\Marko\AppData\Roaming\.minecraft\crash-reports\crash-2013-01-30_18.07.00-client.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 1fc8a474 --------
Full report at:
C:\Users*****\AppData\Roaming\.minecraft\crash-reports\crash-2013-01-30_18.07.00-client.txt
Please show that file to Mojang, NOT just this screen!

Generated 30.1.2013 18:07

– Head –
Stacktrace:
at ake.a(SourceFile:53)
at aof.b_(SourceFile:545)
at bex.a(SourceFile:6992)
at bex.c(SourceFile:4832)
at bex.p(SourceFile:3628)
at bex.a(SourceFile:796)
at bex.a(SourceFile:738)
at bex.a(SourceFile:700)
at bft.a(SourceFile:35)
at bft.a(SourceFile:12)

– Entity being rendered –
Details:
Entity Type: FallingSand (qr)
Entity ID: 3212
Entity Name: Falling Block
Entity's Exact location: 844,50, 55,68, 45,50
Entity's Block location: World: (844,55,45), Chunk: (at 12,3,13 in 52,2; contains blocks 832,0,32 to 847,255,47), Region: (1,0; contains chunks 32,0 to 63,31, blocks 512,0,0 to 1023,255,511)
Entity's Momentum: 0,00, -0,48, 0,00
Immitating block ID: 145
Immitating block data: 0

– Renderer details –
Details:
Assigned renderer: bft@1b5aba6c
Location: -1,51,-1,47,1,61 - World: (-2,-2,1), Chunk: (at 14,-1,1 in -1,0; contains blocks -16,0,0 to -1,255,15), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
Rotation: 0.0
Delta: 0.045216084
Stacktrace:
at bfq.a(SourceFile:200)
at bfq.a(SourceFile:180)
at beq.a(SourceFile:307)
at bei.a(SourceFile:887)

– Affected level –
Details:
Level name: MpServer
All players: 1 total; [bcn['*******'/16, l='MpServer', x=846,01, y=57,62, z=43,89]]
Chunk stats: MultiplayerChunkCache: 441
Level seed: 0
Level generator: ID 01 - flat, ver 0. Features enabled: false
Level generator options:
Level spawn location: World: (662,4,-55), Chunk: (at 6,0,9 in 41,-4; contains blocks 656,0,-64 to 671,255,-49), Region: (1,-1; contains chunks 32,-32 to 63,-1, blocks 512,0,-512 to 1023,255,-1)
Level time: 1162527 game time, 7165 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: Game mode: creative (ID 1). Hardcore: false. Cheats: false
Forced entities: 4 total; [mu['Experience Orb'/2287, l='MpServer', x=850,37, y=55,25, z=67,25], bcn['*******'/16, l='MpServer', x=846,01, y=57,62, z=43,89], mu['Experience Orb'/686, l='MpServer', x=848,42, y=56,25, z=41,18], qr['Falling Block'/3212, l='MpServer', x=844,50, y=55,68, z=45,50]]
Retry entities: 0 total; []
Stacktrace:
at bck.a(SourceFile:281)
at net.minecraft.client.Minecraft.b(SourceFile:1870)
at net.minecraft.client.Minecraft.run(SourceFile:535)
at java.lang.Thread.run(Unknown Source)

– System Details –
Details:
Minecraft Version: 13w04a
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.7.0_07, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 234674320 bytes (223 MB) / 648740864 bytes (618 MB) up to 954466304 bytes (910 MB)
JVM Flags: 2 total; -Xms512m -Xmx1024m
AABB Pool Size: 468 (26208 bytes; 0 MB) allocated, 70 (3920 bytes; 0 MB) used
Suspicious classes: No suspicious classes found.
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
LWJGL: 2.4.2
OpenGL: AMD Radeon HD 7670M GL version 4.2.11478 Compatibility Profile Context, ATI Technologies Inc.
Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Texture Pack: mc texturepack
Profiler Position: N/A (disabled)
Vec3 Pool Size: 175 (9800 bytes; 0 MB) allocated, 69 (3864 bytes; 0 MB) used

java.lang.ArrayIndexOutOfBoundsException: 3
at ake.a(SourceFile:53)
at aof.b_(SourceFile:545)
at bex.a(SourceFile:6992)
at bex.c(SourceFile:4832)
at bex.p(SourceFile:3628)
at bex.a(SourceFile:796)
at bex.a(SourceFile:738)
at bex.a(SourceFile:700)
at bft.a(SourceFile:35)
at bft.a(SourceFile:12)
at bfq.a(SourceFile:200)
at bfq.a(SourceFile:180)
at beq.a(SourceFile:307)
at bei.a(SourceFile:887)
at bei.b(SourceFile:741)
at net.minecraft.client.Minecraft.K(SourceFile:597)
at net.minecraft.client.Minecraft.run(SourceFile:526)
at java.lang.Thread.run(Unknown Source)
— END ERROR REPORT bd46a01 ----------