Skeleton AI problem?

Please force a crash by pressing F3 + C for 10 seconds while in-game and attach the crash report ([minecraft|http://hopper.minecraft.net/help/finding-minecraft-data-folder]/crash-reports/crash-<DATE>-client.txt) here.

---- Minecraft Crash Report ----
// Ouch. That hurt :(

Time: 24/11/15 19:54
Description: Manually triggered debug crash

java.lang.Throwable
	at bbz.aw(SourceFile:1674)
	at bbz.s(SourceFile:1595)
	at bbz.as(SourceFile:941)
	at bbz.a(SourceFile:385)
	at net.minecraft.client.main.Main.main(SourceFile:122)


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

-- Head --
Stacktrace:
	at bbz.aw(SourceFile:1674)

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [bmf['Sircriperss'/2702865, l='MpServer', x=399,98, y=65,77, z=23,14]]
	Chunk stats: MultiplayerChunkCache: 441, 441
	Level seed: 0
	Level generator: ID 00 - default, ver 1. Features enabled: false
	Level generator options: 
	Level spawn location: World: (176,64,32), Chunk: (at 0,4,0 in 11,2; contains blocks 176,0,32 to 191,255,47), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
	Level time: 1544596 game time, 302310 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: 127 total; [wc['Squid'/2702889, l='MpServer', x=391,66, y=50,72, z=82,38], wc['Squid'/2702888, l='MpServer', x=381,13, y=48,31, z=77,69], wc['Squid'/2702891, l='MpServer', x=399,56, y=53,84, z=65,38], wc['Squid'/2702890, l='MpServer', x=392,09, y=50,25, z=74,66], zf['Zombie'/2702892, l='MpServer', x=396,50, y=25,00, z=90,50], zb['Skeleton'/2702881, l='MpServer', x=389,69, y=20,00, z=5,16], zb['Skeleton'/2702880, l='MpServer', x=389,69, y=20,00, z=3,72], zd['Spider'/2702883, l='MpServer', x=394,50, y=22,00, z=11,50], zf['Zombie'/2702882, l='MpServer', x=395,50, y=22,00, z=11,50], zf['Zombie'/2702885, l='MpServer', x=396,38, y=23,00, z=3,63], yn['Creeper'/2702884, l='MpServer', x=387,50, y=16,00, z=1,50], zf['Zombie'/2702887, l='MpServer', x=384,50, y=29,00, z=61,50], vq['Bat'/2702886, l='MpServer', x=386,19, y=31,10, z=62,84], zb['Skeleton'/2702905, l='MpServer', x=431,53, y=23,00, z=-56,22], wc['Squid'/2702911, l='MpServer', x=424,38, y=56,94, z=-33,22], zb['Skeleton'/2702910, l='MpServer', x=419,47, y=21,00, z=-45,25], wc['Squid'/2702897, l='MpServer', x=390,03, y=62,24, z=4,13], wc['Squid'/2702896, l='MpServer', x=406,00, y=46,53, z=-37,81], wc['Squid'/2702899, l='MpServer', x=399,69, y=49,28, z=71,88], wc['Squid'/2702898, l='MpServer', x=402,22, y=51,81, z=67,91], wc['Squid'/2702901, l='MpServer', x=412,22, y=47,94, z=87,09], yn['Creeper'/2702857, l='MpServer', x=379,50, y=17,00, z=20,50], wc['Squid'/2702856, l='MpServer', x=381,97, y=60,22, z=19,61], zb['Skeleton'/2702859, l='MpServer', x=377,59, y=62,09, z=44,31], wc['Squid'/2702858, l='MpServer', x=367,81, y=58,22, z=25,84], zf['Zombie'/2702861, l='MpServer', x=372,50, y=28,00, z=64,50], zf['Zombie'/2702860, l='MpServer', x=372,50, y=28,00, z=61,50], wc['Squid'/2702863, l='MpServer', x=370,13, y=53,09, z=78,94], yn['Creeper'/2702849, l='MpServer', x=378,50, y=36,00, z=-30,50], ze['Witch'/2702848, l='MpServer', x=375,47, y=36,00, z=-35,16], yn['Creeper'/2702851, l='MpServer', x=383,50, y=14,00, z=-6,50], yn['Creeper'/2702850, l='MpServer', x=380,50, y=36,00, z=-30,50], zb['Skeleton'/2702853, l='MpServer', x=372,50, y=26,00, z=11,50], vq['Bat'/2702852, l='MpServer', x=380,59, y=14,10, z=-0,28], zb['Skeleton'/2702855, l='MpServer', x=379,78, y=23,00, z=1,47], zf['Zombie'/2702854, l='MpServer', x=379,50, y=25,00, z=10,50], zf['Zombie'/2702873, l='MpServer', x=395,50, y=19,00, z=-53,19], yn['Creeper'/2702875, l='MpServer', x=384,50, y=14,00, z=-4,50], zf['Zombie'/2702874, l='MpServer', x=389,50, y=15,00, z=-22,50], wc['Squid'/2702877, l='MpServer', x=393,59, y=61,88, z=-17,66], zb['Skeleton'/2702876, l='MpServer', x=385,50, y=14,00, z=-7,22], zf['Zombie'/2702879, l='MpServer', x=391,50, y=25,00, z=15,50], wc['Squid'/2702878, l='MpServer', x=389,44, y=60,19, z=-10,63], vq['Bat'/2702867, l='MpServer', x=393,75, y=11,00, z=-34,25], vq['Bat'/2702869, l='MpServer', x=389,77, y=18,60, z=-53,94], zf['Zombie'/2702868, l='MpServer', x=396,41, y=18,00, z=-51,16], bmf['Sircriperss'/2702865, l='MpServer', x=399,98, y=65,77, z=23,14], zf['Zombie'/2702945, l='MpServer', x=464,50, y=48,00, z=89,31], zb['Skeleton'/2702944, l='MpServer', x=464,50, y=13,00, z=61,50], zf['Zombie'/2702946, l='MpServer', x=464,47, y=48,00, z=89,84], wc['Squid'/2702921, l='MpServer', x=446,34, y=52,25, z=63,38], wc['Squid'/2702920, l='MpServer', x=448,41, y=47,88, z=77,53], wc['Squid'/2702923, l='MpServer', x=462,53, y=50,38, z=-34,44], vq['Bat'/2702925, l='MpServer', x=442,27, y=45,41, z=-22,43], yn['Creeper'/2702924, l='MpServer', x=448,50, y=43,00, z=-24,50], yn['Creeper'/2702927, l='MpServer', x=452,53, y=49,00, z=-19,69], wc['Squid'/2702926, l='MpServer', x=465,47, y=57,63, z=-23,91], wc['Squid'/2702913, l='MpServer', x=422,88, y=54,34, z=-25,28], wc['Squid'/2702915, l='MpServer', x=425,75, y=53,22, z=-5,78], wc['Squid'/2702914, l='MpServer', x=431,31, y=57,28, z=-24,31], wc['Squid'/2702916, l='MpServer', x=425,31, y=54,06, z=-19,06], yn['Creeper'/2702919, l='MpServer', x=446,50, y=63,00, z=-21,50], zb['Skeleton'/2702918, l='MpServer', x=441,50, y=44,00, z=-22,50], yn['Creeper'/2702937, l='MpServer', x=468,34, y=23,00, z=10,13], yn['Creeper'/2702936, l='MpServer', x=464,50, y=22,00, z=-2,16], vq['Bat'/2702939, l='MpServer', x=467,75, y=24,10, z=2,25], yn['Creeper'/2702938, l='MpServer', x=469,50, y=23,00, z=7,50], vq['Bat'/2702941, l='MpServer', x=468,68, y=35,96, z=48,77], zf['Zombie'/2702929, l='MpServer', x=453,50, y=50,00, z=-17,88], zf['Zombie'/2702928, l='MpServer', x=451,50, y=49,00, z=-19,50], yn['Creeper'/2702931, l='MpServer', x=449,41, y=63,00, z=8,84], yn['Creeper'/2702930, l='MpServer', x=463,50, y=23,00, z=4,50], zb['Skeleton'/2702933, l='MpServer', x=472,50, y=24,00, z=-34,50], yn['Creeper'/2702935, l='MpServer', x=479,50, y=31,00, z=-14,50], vq['Bat'/2702781, l='MpServer', x=323,22, y=26,10, z=4,41], wc['Squid'/2702825, l='MpServer', x=357,16, y=52,47, z=57,13], zf['Zombie'/2702824, l='MpServer', x=363,50, y=26,00, z=60,50], vq['Bat'/2702827, l='MpServer', x=358,23, y=22,97, z=72,52], wc['Squid'/2702826, l='MpServer', x=364,47, y=51,66, z=62,38], zf['Zombie'/2702829, l='MpServer', x=354,50, y=20,00, z=73,50], zf['Zombie'/2702828, l='MpServer', x=353,50, y=20,00, z=74,50], wc['Squid'/2702831, l='MpServer', x=366,16, y=52,03, z=69,66], zd['Spider'/2702830, l='MpServer', x=354,97, y=20,00, z=70,50], wc['Squid'/2702817, l='MpServer', x=357,34, y=50,97, z=16,16], wc['Squid'/2702816, l='MpServer', x=352,53, y=46,56, z=9,28], wc['Squid'/2702819, l='MpServer', x=366,78, y=56,91, z=10,94], wc['Squid'/2702818, l='MpServer', x=362,59, y=61,38, z=7,78], yn['Creeper'/2702821, l='MpServer', x=359,31, y=18,00, z=24,50], zf['Zombie'/2702820, l='MpServer', x=365,50, y=21,00, z=29,50], zf['Zombie'/2702823, l='MpServer', x=364,50, y=21,00, z=46,50], wc['Squid'/2702822, l='MpServer', x=364,78, y=62,09, z=22,69], yn['Creeper'/2702841, l='MpServer', x=371,50, y=39,00, z=-48,50], yn['Creeper'/2702843, l='MpServer', x=369,50, y=33,00, z=-34,50], yn['Creeper'/2702842, l='MpServer', x=374,50, y=18,00, z=-43,50], zb['Skeleton'/2702845, l='MpServer', x=373,50, y=34,00, z=-35,50], yn['Creeper'/2702844, l='MpServer', x=366,88, y=34,00, z=-34,47], ze['Witch'/2702847, l='MpServer', x=379,09, y=36,00, z=-28,47], zb['Skeleton'/2702846, l='MpServer', x=382,50, y=34,00, z=-22,50], wc['Squid'/2702833, l='MpServer', x=353,91, y=52,50, z=69,66], wc['Squid'/2702832, l='MpServer', x=367,47, y=51,22, z=63,75], wc['Squid'/2702835, l='MpServer', x=357,84, y=53,03, z=64,66], wc['Squid'/2702834, l='MpServer', x=355,56, y=51,91, z=66,59], wc['Squid'/2702836, l='MpServer', x=367,25, y=52,94, z=83,81], zf['Zombie'/2702793, l='MpServer', x=349,50, y=18,00, z=21,50], wc['Squid'/2702792, l='MpServer', x=341,50, y=57,72, z=-0,97], yn['Creeper'/2702795, l='MpServer', x=342,50, y=18,00, z=24,50], yn['Creeper'/2702794, l='MpServer', x=350,34, y=16,00, z=27,34], wc['Squid'/2702797, l='MpServer', x=341,78, y=52,19, z=29,41], wc['Squid'/2702796, l='MpServer', x=347,44, y=48,28, z=21,56], vq['Bat'/2702799, l='MpServer', x=344,69, y=22,00, z=45,36], wc['Squid'/2702798, l='MpServer', x=351,44, y=53,84, z=31,44], wc['Squid'/2702789, l='MpServer', x=344,19, y=61,72, z=-27,16], wc['Squid'/2702791, l='MpServer', x=342,53, y=53,34, z=3,78], zd['Spider'/2702790, l='MpServer', x=338,88, y=23,00, z=-1,16], yn['Creeper'/2702809, l='MpServer', x=367,50, y=39,00, z=-48,50], vq['Bat'/2702811, l='MpServer', x=364,66, y=22,94, z=-29,55], zb['Skeleton'/2702810, l='MpServer', x=362,50, y=26,00, z=-35,88], wc['Squid'/2702813, l='MpServer', x=357,75, y=57,75, z=-25,97], zf['Zombie'/2702812, l='MpServer', x=360,50, y=24,00, z=-28,50], wc['Squid'/2702815, l='MpServer', x=355,47, y=45,56, z=17,03], wc['Squid'/2702814, l='MpServer', x=356,72, y=58,66, z=-11,81], wc['Squid'/2702801, l='MpServer', x=351,06, y=55,03, z=39,75], wc['Squid'/2702800, l='MpServer', x=344,84, y=50,38, z=32,44], zd['Spider'/2702803, l='MpServer', x=348,31, y=20,00, z=72,69], wc['Squid'/2702802, l='MpServer', x=336,44, y=55,03, z=43,94], vq['Bat'/2702805, l='MpServer', x=348,67, y=20,83, z=76,24], vq['Bat'/2702804, l='MpServer', x=351,83, y=25,19, z=72,48]]
	Retry entities: 0 total; []
	Server brand: vanilla
	Server type: Integrated singleplayer server
Stacktrace:
	at bkg.a(SourceFile:363)
	at bbz.b(SourceFile:2495)
	at bbz.a(SourceFile:394)
	at net.minecraft.client.main.Main.main(SourceFile:122)

-- System Details --
Details:
	Minecraft Version: 15w47c
	Operating System: Windows 7 (amd64) version 6.1
	Java Version: 1.8.0_25, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 208939704 bytes (199 MB) / 512172032 bytes (488 MB) up to 2134114304 bytes (2035 MB)
	JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx2G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
	IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
	Launched Version: 15w47c
	LWJGL: 2.9.4
	OpenGL: GeForce GTX 650/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.
Shaders are available because OpenGL 2.1 is supported.
VBOs are available because OpenGL 1.5 is supported.

	Using VBOs: No
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Packs: PureBDcraft 512x MC19.zip
	Current Language: English (US)
	Profiler Position: N/A (disabled)
	CPU: 2x Intel(R) Celeron(R) CPU E3400 @ 2.60GHz

Relates to / duplicate of MC-91290