Hopper: java.lang.NullPointerException

java.lang.NullPointerException
	at ny.a(SourceFile:89)
	at ou.aL(SourceFile:396)
	at ou.z(SourceFile:222)
	at ov.z(SourceFile:128)
	at oc.o_(SourceFile:279)
	at ou.o_(SourceFile:1167)
	at ov.o_(SourceFile:169)
	at ud.o_(SourceFile:29)
	at un.o_(SourceFile:211)
	at act.a(SourceFile:1365)
	at act.g(SourceFile:1343)

---- Minecraft Crash Report ----
// Ooh. Shiny.

Time: 18:10 07/09/13
Description: Ticking entity

java.lang.NullPointerException
	at ny.a(SourceFile:89)
	at ou.aL(SourceFile:396)
	at ou.z(SourceFile:222)
	at ov.z(SourceFile:128)
	at oc.o_(SourceFile:279)
	at ou.o_(SourceFile:1167)
	at ov.o_(SourceFile:169)
	at ud.o_(SourceFile:29)
	at un.o_(SourceFile:211)
	at act.a(SourceFile:1365)
	at act.g(SourceFile:1343)
	at act.h(SourceFile:1250)
	at awb.m(SourceFile:1426)
	at awb.V(SourceFile:686)
	at awb.e(SourceFile:642)
	at net.minecraft.client.main.Main.main(SourceFile:103)


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

-- Head --
Stacktrace:
	at ny.a(SourceFile:89)
	at ou.aL(SourceFile:396)
	at ou.z(SourceFile:222)
	at ov.z(SourceFile:128)
	at oc.o_(SourceFile:279)
	at ou.o_(SourceFile:1167)
	at ov.o_(SourceFile:169)
	at ud.o_(SourceFile:29)
	at un.o_(SourceFile:211)
	at act.a(SourceFile:1365)
	at act.g(SourceFile:1343)

-- Entity being ticked --
Details:
	Entity Type: Zombie (un)
	Entity ID: 51246
	Entity Name: §6Zombie
	Entity's Exact location: 189.50, 59.00, -267.50
	Entity's Block location: World: (189,59,-268), Chunk: (at 13,3,4 in 11,-17; contains blocks 176,0,-272 to 191,255,-257), Region: (0,-1; contains chunks 0,-32 to 31,-1, blocks 0,0,-512 to 511,255,-1)
	Entity's Momentum: 0.00, 0.00, 0.00
Stacktrace:
	at act.h(SourceFile:1250)

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [bfn['yotamN2'/7533, l='MpServer', x=187.19, y=58.62, z=-265.16]]
	Chunk stats: MultiplayerChunkCache: 240, 240
	Level seed: 0
	Level generator: ID 01 - flat, ver 0. Features enabled: false
	Level generator options: 
	Level spawn location: World: (34,4,-274), Chunk: (at 2,0,14 in 2,-18; contains blocks 32,0,-288 to 47,255,-273), Region: (0,-1; contains chunks 0,-32 to 31,-1, blocks 0,0,-512 to 511,255,-1)
	Level time: 492488 game time, 35928 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: 112 total; [ui['§6Skeleton'/50376, l='MpServer', x=264.50, y=87.00, z=-262.50], un['§6Zombie'/50379, l='MpServer', x=174.50, y=88.00, z=-335.50], uk['§6Spider'/51225, l='MpServer', x=187.61, y=57.00, z=-303.03], un['§6Zombie'/50381, l='MpServer', x=244.50, y=65.00, z=-257.50], un['§6Zombie'/50380, l='MpServer', x=245.50, y=65.00, z=-257.50], uk['§6Spider'/50652, l='MpServer', x=226.41, y=75.00, z=-200.09], ui['§6Skeleton'/50383, l='MpServer', x=258.03, y=65.00, z=-255.50], un['§6Zombie'/50382, l='MpServer', x=243.50, y=65.00, z=-254.50], uk['§6Spider'/44724, l='MpServer', x=179.63, y=88.00, z=-189.78], tw['§6Creeper'/49029, l='MpServer', x=248.50, y=65.00, z=-277.50], ui['§6Skeleton'/51223, l='MpServer', x=190.50, y=57.00, z=-296.50], ui['§6Skeleton'/51222, l='MpServer', x=189.50, y=57.00, z=-296.50], tw['§6Creeper'/50373, l='MpServer', x=262.50, y=87.00, z=-261.50], tw['§6Creeper'/51219, l='MpServer', x=190.50, y=57.00, z=-308.50], tw['§6Creeper'/50375, l='MpServer', x=262.50, y=87.00, z=-257.50], tw['§6Creeper'/50374, l='MpServer', x=264.50, y=87.00, z=-255.50], ui['§6Skeleton'/49053, l='MpServer', x=267.50, y=89.00, z=-292.50], un['§6Zombie'/50634, l='MpServer', x=236.06, y=65.00, z=-297.50], un['§6Zombie'/50633, l='MpServer', x=233.44, y=65.00, z=-297.44], un['§6Zombie'/50632, l='MpServer', x=232.50, y=65.00, z=-296.50], ui['§6Skeleton'/50085, l='MpServer', x=256.50, y=75.00, z=-271.50], uk['§6Spider'/49047, l='MpServer', x=223.72, y=65.68, z=-209.41], tw['§6Creeper'/48772, l='MpServer', x=222.50, y=57.00, z=-309.50], un['§6Zombie'/50631, l='MpServer', x=236.16, y=65.00, z=-295.78], tw['§6Creeper'/48770, l='MpServer', x=221.50, y=57.00, z=-311.50], sd['§6Bat'/49852, l='MpServer', x=146.25, y=62.10, z=-317.25], tw['§6Creeper'/51167, l='MpServer', x=150.03, y=68.00, z=-305.50], sd['§6Bat'/49794, l='MpServer', x=125.54, y=58.94, z=-238.25], sd['§6Bat'/45393, l='MpServer', x=216.50, y=57.10, z=-279.50], un['§6Zombie'/51246, l='MpServer', x=189.50, y=59.00, z=-267.50], un['§6Zombie'/51245, l='MpServer', x=227.44, y=65.00, z=-202.13], sd['§6Bat'/49331, l='MpServer', x=224.25, y=57.10, z=-270.25], uk['§6Spider'/50429, l='MpServer', x=146.16, y=75.00, z=-325.97], tw['§6Creeper'/50060, l='MpServer', x=109.50, y=87.00, z=-228.50], un['§6Zombie'/44253, l='MpServer', x=167.88, y=57.00, z=-254.78], ui['§6Skeleton'/50312, l='MpServer', x=216.50, y=76.00, z=-329.50], ui['§6Skeleton'/46942, l='MpServer', x=178.13, y=87.00, z=-325.56], sd['§6Bat'/51106, l='MpServer', x=128.25, y=58.76, z=-234.75], sd['§6Bat'/28263, l='MpServer', x=174.25, y=58.10, z=-291.25], uy['§6arrow'/7555, l='MpServer', x=177.41, y=56.97, z=-249.16], pa['§6Painting'/7552, l='MpServer', x=176.06, y=64.00, z=-295.00], pa['§6Painting'/7553, l='MpServer', x=176.06, y=64.00, z=-293.00], tw['§6Creeper'/50345, l='MpServer', x=195.50, y=87.00, z=-332.50], tw['§6Creeper'/48880, l='MpServer', x=137.50, y=76.00, z=-197.50], uk['§6Spider'/50341, l='MpServer', x=209.19, y=87.00, z=-195.09], sd['§6Bat'/7566, l='MpServer', x=196.53, y=58.10, z=-290.53], sd['§6Bat'/7567, l='MpServer', x=201.50, y=58.10, z=-288.25], sd['§6Bat'/51060, l='MpServer', x=207.25, y=57.00, z=-220.28], tw['§6Creeper'/49707, l='MpServer', x=244.50, y=57.00, z=-317.50], uy['§6arrow'/7534, l='MpServer', x=193.16, y=56.97, z=-263.97], tw['§6Creeper'/50519, l='MpServer', x=197.50, y=88.00, z=-335.50], tw['§6Creeper'/49160, l='MpServer', x=178.50, y=65.00, z=-215.50], tw['§6Creeper'/49162, l='MpServer', x=180.50, y=65.00, z=-214.84], sd['§6Bat'/49698, l='MpServer', x=251.25, y=58.00, z=-220.75], ui['§6Skeleton'/50521, l='MpServer', x=202.56, y=89.00, z=-335.13], ui['§6Skeleton'/49429, l='MpServer', x=221.50, y=57.00, z=-276.84], ui['§6Skeleton'/50520, l='MpServer', x=194.50, y=88.00, z=-335.50], ui['§6Skeleton'/49428, l='MpServer', x=211.50, y=57.00, z=-288.50], tw['§6Creeper'/49159, l='MpServer', x=182.13, y=65.00, z=-211.84], tw['§6Creeper'/50254, l='MpServer', x=118.50, y=75.00, z=-316.50], pa['§6Painting'/7548, l='MpServer', x=176.06, y=62.50, z=-293.00], uk['§6Spider'/49961, l='MpServer', x=114.50, y=57.00, z=-259.50], pa['§6Painting'/7549, l='MpServer', x=176.06, y=62.50, z=-295.00], pa['§6Painting'/7550, l='MpServer', x=176.06, y=63.50, z=-296.50], pa['§6Painting'/7551, l='MpServer', x=181.50, y=64.50, z=-298.94], un['§6Zombie'/49726, l='MpServer', x=224.28, y=57.00, z=-239.91], sn['§6Pig'/168, l='MpServer', x=142.75, y=57.00, z=-289.50], sn['§6Pig'/175, l='MpServer', x=135.81, y=57.00, z=-258.50], tw['§6Creeper'/45797, l='MpServer', x=259.50, y=77.00, z=-220.50], sn['§6Pig'/174, l='MpServer', x=136.91, y=57.00, z=-260.47], sn['§6Pig'/173, l='MpServer', x=136.91, y=57.00, z=-261.72], uk['§6Spider'/49948, l='MpServer', x=201.00, y=57.00, z=-300.41], uk['§6Spider'/48943, l='MpServer', x=153.34, y=65.00, z=-200.59], tw['§6Creeper'/49931, l='MpServer', x=155.50, y=77.00, z=-334.50], un['§6Zombie'/50295, l='MpServer', x=186.22, y=87.00, z=-330.78], sn['§6Pig'/178, l='MpServer', x=134.53, y=57.00, z=-263.53], tw['§6Creeper'/50298, l='MpServer', x=174.53, y=89.00, z=-337.03], sn['§6Pig'/179, l='MpServer', x=136.91, y=57.00, z=-263.53], tw['§6Creeper'/50297, l='MpServer', x=181.50, y=87.00, z=-325.50], sn['§6Pig'/176, l='MpServer', x=135.66, y=57.00, z=-262.91], tw['§6Creeper'/50296, l='MpServer', x=180.09, y=87.00, z=-329.44], sn['§6Pig'/177, l='MpServer', x=140.34, y=57.00, z=-268.53], sn['§6Pig'/182, l='MpServer', x=143.69, y=63.00, z=-240.47], sn['§6Pig'/183, l='MpServer', x=130.25, y=57.00, z=-253.50], tw['§6Creeper'/50301, l='MpServer', x=238.50, y=57.00, z=-312.50], ui['§6Skeleton'/49499, l='MpServer', x=157.50, y=65.00, z=-202.50], ui['§6Skeleton'/49498, l='MpServer', x=159.50, y=65.00, z=-202.50], tw['§6Creeper'/49772, l='MpServer', x=225.25, y=87.00, z=-202.88], tw['§6Creeper'/50452, l='MpServer', x=268.50, y=76.00, z=-287.50], tw['§6Creeper'/49503, l='MpServer', x=145.50, y=65.00, z=-328.50], tw['§6Creeper'/49771, l='MpServer', x=226.50, y=87.00, z=-204.50], un['§6Zombie'/50449, l='MpServer', x=219.50, y=57.00, z=-203.50], ui['§6Skeleton'/49501, l='MpServer', x=158.50, y=65.00, z=-200.50], ui['§6Skeleton'/49500, l='MpServer', x=152.59, y=65.00, z=-212.16], sd['§6Bat'/50197, l='MpServer', x=223.75, y=61.10, z=-238.41], sd['§6Bat'/50196, l='MpServer', x=196.89, y=57.85, z=-232.03], sd['§6Bat'/50193, l='MpServer', x=218.75, y=62.10, z=-234.75], bfn['yotamN2'/7533, l='MpServer', x=187.19, y=58.62, z=-265.16], sd['§6Bat'/46805, l='MpServer', x=129.75, y=61.10, z=-269.75], pa['§6Painting'/7552, l='MpServer', x=176.06, y=64.00, z=-295.00], pa['§6Painting'/7553, l='MpServer', x=176.06, y=64.00, z=-293.00], pa['§6Painting'/7548, l='MpServer', x=176.06, y=62.50, z=-293.00], tw['§6Creeper'/50011, l='MpServer', x=256.25, y=65.00, z=-256.47], tw['§6Creeper'/50010, l='MpServer', x=263.56, y=65.00, z=-254.03], ui['§6Skeleton'/50218, l='MpServer', x=150.50, y=57.00, z=-284.50], un['§6Zombie'/49728, l='MpServer', x=217.50, y=57.00, z=-240.50], pa['§6Painting'/7549, l='MpServer', x=176.06, y=62.50, z=-295.00], pa['§6Painting'/7550, l='MpServer', x=176.06, y=63.50, z=-296.50], pa['§6Painting'/7551, l='MpServer', x=181.50, y=64.50, z=-298.94], sd['§6Bat'/49018, l='MpServer', x=188.56, y=59.10, z=-230.50], sd['§6Bat'/49019, l='MpServer', x=196.25, y=61.10, z=-228.75], un['§6Zombie'/47108, l='MpServer', x=166.50, y=57.00, z=-229.50]]
	Retry entities: 0 total; []
	Server brand: vanilla
	Server type: Non-integrated multiplayer server
Stacktrace:
	at bfi.a(SourceFile:285)
	at awb.b(SourceFile:1813)
	at awb.e(SourceFile:651)
	at net.minecraft.client.main.Main.main(SourceFile:103)

-- System Details --
Details:
	Minecraft Version: 13w36b
	Operating System: Windows 8 (amd64) version 6.2
	Java Version: 1.7.0_25, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 125278816 bytes (119 MB) / 353239040 bytes (336 MB) up to 2863333376 bytes (2730 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx3G
	AABB Pool Size: 12213 (683928 bytes; 0 MB) allocated, 1269 (71064 bytes; 0 MB) used
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	Launched Version: 13w36b
	LWJGL: 2.9.0
	OpenGL: GeForce 8400 GS/PCIe/SSE2 GL version 3.3.0, NVIDIA Corporation
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Packs: [Atherys Ascended x32 1.6.2 V.2.0.zip]
	Current Language: English (US)
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 442 (24752 bytes; 0 MB) allocated, 204 (11424 bytes; 0 MB) used