Minecraft crash when damage mobs

---- Minecraft Crash Report ----
// Oh - I know what I did wrong!

Time: 06.02.14 20:10
Description: Unexpected error

java.lang.ArrayIndexOutOfBoundsException: -1
	at brf.a(SourceFile:286)
	at bsv.a(SourceFile:149)
	at bsv.b(SourceFile:62)
	at bsv.b(SourceFile:40)
	at bro.a(SourceFile:220)
	at brn.a(SourceFile:218)
	at bqy.a(SourceFile:1495)
	at bqr.a(SourceFile:1183)
	at bqr.b(SourceFile:937)
	at bdf.ag(SourceFile:805)
	at bdf.f(SourceFile:732)
	at net.minecraft.client.main.Main.main(SourceFile:154)


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

-- Head --
Stacktrace:
	at brf.a(SourceFile:286)
	at bsv.a(SourceFile:149)
	at bsv.b(SourceFile:62)
	at bsv.b(SourceFile:40)
	at bro.a(SourceFile:220)
	at brn.a(SourceFile:218)
	at bqy.a(SourceFile:1495)
	at bqr.a(SourceFile:1183)

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [bqh['Muxan500'/54, l='MpServer', x=1400,60, y=4,00, z=-451,50]]
	Chunk stats: MultiplayerChunkCache: 526, 526
	Level seed: 0
	Level generator: ID 01 - flat, ver 0. Features enabled: false
	Level generator options: 
	Level spawn location: 1523,00,4,00,-206,00 - World: (1523,4,-206), Chunk: (at 3,0,2 in 95,-13; contains blocks 1520,0,-208 to 1535,255,-193), Region: (2,-1; contains chunks 64,-32 to 95,-1, blocks 1024,0,-512 to 1535,255,-1)
	Level time: 15042 game time, 1780 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: survival (ID 0). Hardcore: false. Cheats: false
	Forced entities: 44 total; [zj['???????'/136868, l='MpServer', x=1398,87, y=4,60, z=-450,73], zj['???????'/120999, l='MpServer', x=1404,89, y=5,98, z=-451,99], wr['??????'/2, l='MpServer', x=1355,56, y=4,00, z=-388,25], zj['???????'/64, l='MpServer', x=1466,78, y=3,41, z=-428,38], zj['???????'/136866, l='MpServer', x=1398,44, y=4,60, z=-453,00], zj['???????'/136867, l='MpServer', x=1401,23, y=4,60, z=-453,26], zj['???????'/46524, l='MpServer', x=1358,76, y=4,47, z=-479,98], zj['???????'/20395, l='MpServer', x=1403,50, y=4,83, z=-448,59], wr['??????'/51125, l='MpServer', x=1377,50, y=4,00, z=-419,53], wp['??????'/14, l='MpServer', x=1375,31, y=4,00, z=-392,66], wr['??????'/15, l='MpServer', x=1375,16, y=4,00, z=-384,97], zj['???????'/49243, l='MpServer', x=1394,76, y=4,00, z=-379,64], zj['???????'/96849, l='MpServer', x=1359,42, y=4,95, z=-444,36], bqh['Muxan500'/54, l='MpServer', x=1400,60, y=4,00, z=-451,50], zj['???????'/106070, l='MpServer', x=1478,43, y=5,00, z=-394,63], zj['???????'/94432, l='MpServer', x=1437,09, y=4,00, z=-383,90], zj['???????'/102306, l='MpServer', x=1482,66, y=4,00, z=-392,68], zj['???????'/30, l='MpServer', x=1481,13, y=4,00, z=-391,44], zj['???????'/1183, l='MpServer', x=1390,95, y=4,48, z=-461,74], zj['???????'/133272, l='MpServer', x=1405,50, y=4,00, z=-450,53], st['????? ?????'/140694, l='MpServer', x=44895,64, y=128,05, z=-14537,94], zj['???????'/140695, l='MpServer', x=1402,51, y=4,17, z=-454,76], zj['???????'/39, l='MpServer', x=1464,85, y=4,57, z=-399,85], st['????? ?????'/140693, l='MpServer', x=44895,64, y=128,59, z=-14537,80], zj['???????'/108420, l='MpServer', x=1356,65, y=4,85, z=-501,38], zj['???????'/81779, l='MpServer', x=1407,32, y=4,69, z=-453,40], zj['???????'/140696, l='MpServer', x=1403,71, y=4,10, z=-454,74], zj['???????'/140697, l='MpServer', x=1402,45, y=4,05, z=-453,69], zj['???????'/133270, l='MpServer', x=1405,53, y=4,00, z=-453,75], zj['???????'/133271, l='MpServer', x=1409,09, y=4,00, z=-452,31], st['????? ?????'/133268, l='MpServer', x=1406,42, y=4,00, z=-453,16], zj['???????'/36323, l='MpServer', x=1414,58, y=4,95, z=-436,40], st['????? ?????'/133269, l='MpServer', x=1407,07, y=4,00, z=-452,40], zj['???????'/121831, l='MpServer', x=1366,49, y=4,85, z=-398,40], zj['???????'/129356, l='MpServer', x=1477,32, y=4,62, z=-509,40], zj['???????'/55, l='MpServer', x=1360,90, y=4,00, z=-505,51], zj['???????'/59, l='MpServer', x=1397,26, y=5,00, z=-458,56], zj['???????'/58, l='MpServer', x=1396,90, y=4,00, z=-475,36], zj['???????'/57, l='MpServer', x=1378,75, y=4,00, z=-468,16], zj['???????'/12554, l='MpServer', x=1410,69, y=4,00, z=-501,41], zj['???????'/56, l='MpServer', x=1365,90, y=4,00, z=-463,40], zj['???????'/62, l='MpServer', x=1419,82, y=4,94, z=-433,96], zj['???????'/61, l='MpServer', x=1422,16, y=4,00, z=-437,19], zj['???????'/60, l='MpServer', x=1403,05, y=4,00, z=-466,89]]
	Retry entities: 0 total; []
	Server brand: vanilla
	Server type: Integrated singleplayer server
Stacktrace:
	at boe.a(SourceFile:308)
	at bdf.b(SourceFile:2017)
	at bdf.f(SourceFile:746)
	at net.minecraft.client.main.Main.main(SourceFile:154)

-- System Details --
Details:
	Minecraft Version: 14w06a
	Operating System: Windows 8 (amd64) version 6.2
	Java Version: 1.7.0_45, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 50547960 bytes (48 MB) / 306708480 bytes (292 MB) up to 954728448 bytes (910 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	Launched Version: 14w06a
	LWJGL: 2.9.1
	OpenGL: GeForce GTX 550 Ti/PCIe/SSE2 GL version 4.4.0, NVIDIA Corporation
	GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
Anisotropic filtering is supported and maximum anisotropy is 16.
Shaders are available because OpenGL 2.1 is supported.

	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Packs: [2203_174.zip]
	Current Language: English (US)
	Profiler Position: N/A (disabled)
	Anisotropic Filtering: On (16)