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I placed a head of me in a LAN server, and this happened:

---- Minecraft Crash Report ----
// This is a token for 1 free hug. Redeem at your nearest Mojangsta: [~~HUG~~]

Time: 08/04/14 3:58 PM
Description: Unexpected error

java.lang.NullPointerException: Unexpected error
at att.d(SourceFile:88)
at att.a(SourceFile:77)
at ahf.a(SourceFile:79)
at agh.a(SourceFile:122)
at bqq.a(SourceFile:304)
at bfr.ak(SourceFile:1256)
at bfr.p(SourceFile:1602)
at bfr.ai(SourceFile:801)
at bfr.f(SourceFile:755)
at net.minecraft.client.main.Main.main(SourceFile:121)


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

-- Head --
Stacktrace:
at att.d(SourceFile:88)
at att.a(SourceFile:77)
at ahf.a(SourceFile:79)
at agh.a(SourceFile:122)
at bqq.a(SourceFile:304)
at bfr.ak(SourceFile:1256)

-- Affected level --
Details:
Level name: MpServer
All players: 2 total; [bsv['jingm'/1033354, l='MpServer', x=178.24, y=63.00, z=2930.95], bsw['jangm'/11971, l='MpServer', x=122.13, y=63.00, z=2901.06]]
Chunk stats: MultiplayerChunkCache: 289, 289
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: 187.00,63.00,2923.00 - World: (187,63,2923), Chunk: (at 11,3,11 in 11,182; contains blocks 176,0,2912 to 191,255,2927), Region: (0,5; contains chunks 0,160 to 31,191, blocks 0,0,2560 to 511,255,3071)
Level time: 1679492 game time, 6240 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: 87 total; [bsv['jingm'/1033354, l='MpServer', x=178.24, y=63.00, z=2930.95], za['item.tile.tallgrass.grass'/977565, l='MpServer', x=184.59, y=63.00, z=2901.84], za['item.item.seeds'/957046, l='MpServer', x=145.13, y=63.00, z=2888.06], za['item.item.egg'/988559, l='MpServer', x=144.50, y=63.00, z=2889.56], za['item.item.carrots'/969060, l='MpServer', x=167.03, y=63.00, z=2900.09], za['item.item.seeds'/956503, l='MpServer', x=146.28, y=63.00, z=2888.09], yb['Cat'/476698, l='MpServer', x=194.13, y=63.00, z=2932.19], xv['Cow'/657469, l='MpServer', x=177.73, y=63.00, z=2902.28], ye['jeb_'/756842, l='MpServer', x=145.44, y=63.00, z=2962.53], xs['Bat'/1033517, l='MpServer', x=162.00, y=35.00, z=2908.59], za['item.tile.tallgrass.grass'/977556, l='MpServer', x=184.59, y=63.00, z=2900.91], za['item.item.carrots'/968335, l='MpServer', x=168.13, y=63.00, z=2900.50], abj['Villager'/12068, l='MpServer', x=150.69, y=53.00, z=2852.50], za['item.item.egg'/967036, l='MpServer', x=128.59, y=53.00, z=2971.97], za['item.item.seeds'/962575, l='MpServer', x=143.75, y=63.00, z=2887.38], ye['Sheep'/683069, l='MpServer', x=180.06, y=63.00, z=2897.06], xu['Chicken'/593516, l='MpServer', x=148.47, y=63.00, z=2889.50], za['item.item.seeds'/959111, l='MpServer', x=146.53, y=63.00, z=2887.16], za['item.tile.tallgrass.grass'/977341, l='MpServer', x=183.47, y=63.00, z=2899.00], xv['Cow'/657927, l='MpServer', x=172.06, y=63.00, z=2899.75], za['item.tile.tallgrass.grass'/977812, l='MpServer', x=185.44, y=63.00, z=2902.28], xu['Chicken'/592134, l='MpServer', x=148.59, y=63.00, z=2887.38], za['item.item.wheat'/975148, l='MpServer', x=175.56, y=63.00, z=2901.59], xs['Bat'/1033525, l='MpServer', x=101.44, y=14.05, z=2965.69], xu['Chicken'/594092, l='MpServer', x=144.82, y=63.00, z=2890.41], xu['Chicken'/593106, l='MpServer', x=144.66, y=63.00, z=2885.59], za['item.tile.tallgrass.grass'/977419, l='MpServer', x=182.13, y=63.00, z=2898.19], ub['entity.ItemFrame.name'/31101, l='MpServer', x=179.50, y=64.50, z=2933.03], xu['Chicken'/592397, l='MpServer', x=143.81, y=63.00, z=2890.50], ze['container.minecart'/12040, l='MpServer', x=121.47, y=27.06, z=2944.50], xu['Chicken'/592667, l='MpServer', x=144.18, y=63.00, z=2889.49], za['item.tile.tallgrass.grass'/977594, l='MpServer', x=183.78, y=63.00, z=2902.31], xu['Chicken'/12042, l='MpServer', x=129.34, y=62.50, z=2969.72], ye['jeb_'/773197, l='MpServer', x=181.94, y=63.00, z=2930.03], ye['Sheep'/682855, l='MpServer', x=181.91, y=63.00, z=2897.13], za['item.item.carrots'/969702, l='MpServer', x=171.03, y=63.00, z=2899.47], yd['Pig'/675149, l='MpServer', x=166.34, y=63.00, z=2901.78], za['item.item.egg'/946593, l='MpServer', x=141.22, y=57.00, z=2935.72], xu['Lucky Chicken'/920173, l='MpServer', x=179.34, y=63.00, z=2939.50], za['item.item.wheat'/975000, l='MpServer', x=176.69, y=63.00, z=2898.06], za['item.item.wheat'/974865, l='MpServer', x=174.78, y=63.00, z=2899.63], za['item.item.wheat'/976204, l='MpServer', x=175.91, y=63.00, z=2898.28], xu['Chicken'/12057, l='MpServer', x=142.59, y=62.43, z=2937.09], xv['Cow'/657391, l='MpServer', x=177.72, y=63.00, z=2898.44], xs['Bat'/991788, l='MpServer', x=152.40, y=42.69, z=2929.76], zk['entity.MinecartRideable.name'/12058, l='MpServer', x=136.50, y=26.00, z=2950.47], ub['entity.ItemFrame.name'/30788, l='MpServer', x=181.50, y=64.50, z=2935.97], yd['Pig'/675697, l='MpServer', x=166.06, y=63.00, z=2898.56], yj['Iron Golem'/12053, l='MpServer', x=130.53, y=47.00, z=2923.03], ye['Sheep'/683004, l='MpServer', x=184.94, y=63.00, z=2902.09], ub['entity.ItemFrame.name'/30260, l='MpServer', x=183.50, y=64.50, z=2935.97], xs['Bat'/1033460, l='MpServer', x=160.31, y=34.48, z=2922.84], xs['Bat'/1033461, l='MpServer', x=149.00, y=41.73, z=2929.06], xs['Bat'/1033462, l='MpServer', x=159.88, y=32.51, z=2919.50], za['item.tile.tallgrass.grass'/977391, l='MpServer', x=183.59, y=63.00, z=2900.13], yd['Pig'/675486, l='MpServer', x=167.00, y=63.00, z=2900.00], ye['Dinnerbone'/861886, l='MpServer', x=147.91, y=63.00, z=2962.53], za['item.item.seeds'/961107, l='MpServer', x=145.56, y=63.00, z=2886.88], yd['Pig'/675355, l='MpServer', x=167.34, y=63.00, z=2897.50], za['item.tile.tallgrass.grass'/977498, l='MpServer', x=181.91, y=63.00, z=2900.31], xw['Horse'/12129, l='MpServer', x=192.28, y=63.00, z=2937.16], za['item.item.wheat'/974955, l='MpServer', x=176.75, y=63.00, z=2898.97], za['item.item.carrots'/969242, l='MpServer', x=166.06, y=63.00, z=2899.97], yl['Wolf'/481412, l='MpServer', x=194.19, y=63.00, z=2930.69], za['item.tile.tallgrass.grass'/977740, l='MpServer', x=184.41, y=63.00, z=2898.06], za['item.item.wheat'/975580, l='MpServer', x=173.69, y=63.00, z=2901.44], bsw['jangm'/11971, l='MpServer', x=122.13, y=63.00, z=2901.06], za['item.item.seeds'/957912, l='MpServer', x=147.53, y=63.00, z=2888.63], yd['Pig'/674982, l='MpServer', x=166.06, y=63.00, z=2897.06], ye['Sheep'/694050, l='MpServer', x=182.34, y=63.00, z=2898.34], za['item.tile.tallgrass.grass'/977484, l='MpServer', x=182.22, y=63.00, z=2901.88], ye['Sheep'/682909, l='MpServer', x=185.41, y=63.00, z=2898.22], xu['Chicken'/12148, l='MpServer', x=230.25, y=62.38, z=2939.81], za['item.item.carrots'/968145, l='MpServer', x=169.31, y=63.00, z=2899.69], za['item.tile.tallgrass.grass'/977770, l='MpServer', x=185.16, y=63.00, z=2899.44], bsw['jangm'/11971, l='MpServer', x=122.13, y=63.00, z=2901.06], xv['Cow'/657604, l='MpServer', x=174.50, y=63.00, z=2897.06], za['item.tile.tallgrass.grass'/977370, l='MpServer', x=183.13, y=63.00, z=2901.44], ye['Grumm'/858496, l='MpServer', x=146.72, y=63.00, z=2962.06], yj['Iron Golem'/11973, l='MpServer', x=184.69, y=58.00, z=2916.28], yj['Iron Golem'/11972, l='MpServer', x=188.94, y=58.00, z=2915.22], za['item.item.wheat'/975602, l='MpServer', x=172.91, y=63.00, z=2901.69], yj['Iron Golem'/12115, l='MpServer', x=184.69, y=58.00, z=2911.69], yj['Iron Golem'/12114, l='MpServer', x=189.28, y=58.00, z=2912.66], xv['Cow'/657751, l='MpServer', x=172.06, y=63.00, z=2897.06], za['item.tile.tallgrass.grass'/977519, l='MpServer', x=181.28, y=63.00, z=2898.91], za['item.item.wheat'/974939, l='MpServer', x=175.94, y=63.00, z=2900.22]]
Retry entities: 0 total; []
Server brand: vanilla
Server type: Non-integrated multiplayer server
Stacktrace:
at bqr.a(SourceFile:308)
at bfr.b(SourceFile:2069)
at bfr.f(SourceFile:769)
at net.minecraft.client.main.Main.main(SourceFile:121)

-- System Details --
Details:
Minecraft Version: 14w11b
Operating System: Windows 8 (amd64) version 6.2
Java Version: 1.7.0_60-ea, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 308869856 bytes (294 MB) / 416808960 bytes (397 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: 14w11b
LWJGL: 2.9.1
OpenGL: AMD Radeon HD 7570 GL version 4.2.11774 Compatibility Profile Context, ATI Technologies Inc.
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: []
Current Language: English (US)
Profiler Position: N/A (disabled)
Anisotropic Filtering: On (16)

help me plz