Hopper: java.lang.NullPointerException

java.lang.NullPointerException
	at aas.a(SourceFile:54)
	at aba.a(SourceFile:809)
	at wb.a(SourceFile:53)
	at wa.a(SourceFile:81)
	at wu.c(SourceFile:78)
	at vo.a(SourceFile:222)
	at bfh.a(SourceFile:295)
	at azw.a(SourceFile:582)
	at azw.b(SourceFile:555)
	at ayw.d(SourceFile:143)
	at ayw.m(SourceFile:110)

---- Minecraft Crash Report ----
// Oops.

Time: 6-9-13 16:03
Description: Updating screen events

java.lang.NullPointerException
	at aas.a(SourceFile:54)
	at aba.a(SourceFile:809)
	at wb.a(SourceFile:53)
	at wa.a(SourceFile:81)
	at wu.c(SourceFile:78)
	at vo.a(SourceFile:222)
	at bfh.a(SourceFile:295)
	at azw.a(SourceFile:582)
	at azw.b(SourceFile:555)
	at ayw.d(SourceFile:143)
	at ayw.m(SourceFile:110)
	at awb.m(SourceFile:1202)
	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 aas.a(SourceFile:54)
	at aba.a(SourceFile:809)
	at wb.a(SourceFile:53)
	at wa.a(SourceFile:81)
	at wu.c(SourceFile:78)
	at vo.a(SourceFile:222)
	at bfh.a(SourceFile:295)
	at azw.a(SourceFile:582)
	at azw.b(SourceFile:555)
	at ayw.d(SourceFile:143)
	at ayw.m(SourceFile:110)

-- Affected screen --
Details:
	Screen name: bai

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [bfn['megakay'/95, l='MpServer', x=353,35, y=72,62, z=259,97]]
	Chunk stats: MultiplayerChunkCache: 334, 334
	Level seed: 0
	Level generator: ID 00 - default, ver 1. Features enabled: false
	Level generator options: 
	Level spawn location: World: (229,64,293), Chunk: (at 5,4,5 in 14,18; contains blocks 224,0,288 to 239,255,303), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
	Level time: 29460 game time, 7612 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: 124 total; [uj['Slime'/17640, l='MpServer', x=302,41, y=33,00, z=189,31], sg['Cow'/51, l='MpServer', x=288,13, y=65,00, z=198,53], sg['Cow'/54, l='MpServer', x=288,34, y=65,00, z=197,47], sg['Cow'/53, l='MpServer', x=289,53, y=65,00, z=198,53], sg['Cow'/52, l='MpServer', x=290,53, y=66,00, z=197,47], sf['Chicken'/63, l='MpServer', x=314,53, y=68,00, z=282,53], so['Sheep'/68, l='MpServer', x=337,50, y=66,00, z=326,50], so['Sheep'/69, l='MpServer', x=333,50, y=66,00, z=326,50], so['Sheep'/70, l='MpServer', x=330,50, y=66,00, z=326,50], sf['Chicken'/64, l='MpServer', x=317,44, y=67,00, z=300,38], sf['Chicken'/65, l='MpServer', x=314,56, y=66,00, z=300,47], sf['Chicken'/66, l='MpServer', x=309,31, y=64,00, z=289,53], so['Sheep'/67, l='MpServer', x=339,50, y=66,00, z=325,50], uk['Spider'/316643, l='MpServer', x=402,50, y=49,00, z=185,50], so['Sheep'/75, l='MpServer', x=351,34, y=69,00, z=323,44], un['Zombie'/307817, l='MpServer', x=285,44, y=26,00, z=296,47], tw['Creeper'/312599, l='MpServer', x=321,50, y=21,00, z=320,50], un['Zombie'/250422, l='MpServer', x=392,50, y=43,00, z=226,50], ui['Skeleton'/312613, l='MpServer', x=294,56, y=27,00, z=269,94], tw['Creeper'/312615, l='MpServer', x=284,50, y=17,00, z=309,50], un['Zombie'/316515, l='MpServer', x=395,50, y=40,00, z=210,75], bfn['megakay'/95, l='MpServer', x=353,35, y=72,62, z=259,97], os['entity.ItemFrame.name'/213908, l='MpServer', x=343,94, y=71,50, z=276,50], ui['Skeleton'/266313, l='MpServer', x=298,00, y=36,00, z=196,78], tw['Creeper'/316889, l='MpServer', x=354,50, y=25,00, z=338,50], un['Zombie'/316730, l='MpServer', x=378,50, y=54,00, z=185,50], os['entity.ItemFrame.name'/213845, l='MpServer', x=343,94, y=71,50, z=273,50], os['entity.ItemFrame.name'/213853, l='MpServer', x=343,94, y=71,50, z=275,50], os['entity.ItemFrame.name'/213849, l='MpServer', x=343,94, y=71,50, z=274,50], tj['item.item.fish.cod.raw'/266379, l='MpServer', x=313,03, y=68,13, z=275,69], uk['Spider'/315324, l='MpServer', x=288,50, y=11,00, z=330,50], os['entity.ItemFrame.name'/119873, l='MpServer', x=350,50, y=72,50, z=254,94], so['Sheep'/8445, l='MpServer', x=357,56, y=67,00, z=315,19], so['Sheep'/8446, l='MpServer', x=355,38, y=67,00, z=312,31], so['Sheep'/8447, l='MpServer', x=356,97, y=67,00, z=313,94], os['entity.ItemFrame.name'/119876, l='MpServer', x=350,50, y=71,50, z=254,94], os['entity.ItemFrame.name'/119879, l='MpServer', x=348,50, y=71,50, z=254,94], os['entity.ItemFrame.name'/119882, l='MpServer', x=346,50, y=71,50, z=254,94], os['entity.ItemFrame.name'/119887, l='MpServer', x=344,50, y=71,50, z=254,94], os['entity.ItemFrame.name'/20129, l='MpServer', x=348,50, y=72,50, z=242,06], ui['Skeleton'/317360, l='MpServer', x=430,50, y=47,00, z=335,50], ui['Skeleton'/322566, l='MpServer', x=394,47, y=16,00, z=186,98], ui['Skeleton'/322567, l='MpServer', x=394,70, y=15,00, z=189,62], tw['Creeper'/322570, l='MpServer', x=396,50, y=15,00, z=192,50], ui['Skeleton'/322568, l='MpServer', x=395,32, y=15,01, z=186,88], tj['item.item.egg'/260884, l='MpServer', x=319,81, y=68,13, z=284,06], os['entity.ItemFrame.name'/20462, l='MpServer', x=342,50, y=72,50, z=242,06], tj['item.item.egg'/276538, l='MpServer', x=315,63, y=66,13, z=300,56], os['entity.ItemFrame.name'/20459, l='MpServer', x=342,50, y=71,50, z=242,06], os['entity.ItemFrame.name'/20468, l='MpServer', x=341,06, y=72,50, z=243,50], os['entity.ItemFrame.name'/20471, l='MpServer', x=341,06, y=71,50, z=245,50], os['entity.ItemFrame.name'/20465, l='MpServer', x=341,06, y=71,50, z=243,50], os['entity.ItemFrame.name'/20474, l='MpServer', x=341,06, y=72,50, z=245,50], os['entity.ItemFrame.name'/20401, l='MpServer', x=344,50, y=71,50, z=242,06], os['entity.ItemFrame.name'/20404, l='MpServer', x=344,50, y=72,50, z=242,06], os['entity.ItemFrame.name'/20363, l='MpServer', x=348,50, y=71,50, z=242,06], os['entity.ItemFrame.name'/20366, l='MpServer', x=346,50, y=71,50, z=242,06], os['entity.ItemFrame.name'/20369, l='MpServer', x=346,50, y=72,50, z=242,06], ui['Skeleton'/286437, l='MpServer', x=307,75, y=25,00, z=275,78], tw['Creeper'/315631, l='MpServer', x=280,50, y=25,00, z=277,50], tw['Creeper'/315633, l='MpServer', x=279,47, y=25,00, z=281,00], os['entity.ItemFrame.name'/315591, l='MpServer', x=355,94, y=71,50, z=261,50], os['entity.ItemFrame.name'/315598, l='MpServer', x=355,94, y=71,50, z=260,50], os['entity.ItemFrame.name'/315594, l='MpServer', x=355,94, y=72,50, z=260,50], os['entity.ItemFrame.name'/315604, l='MpServer', x=355,94, y=73,50, z=261,50], os['entity.ItemFrame.name'/315607, l='MpServer', x=355,94, y=73,50, z=260,50], os['entity.ItemFrame.name'/315601, l='MpServer', x=355,94, y=72,50, z=261,50], os['entity.ItemFrame.name'/315556, l='MpServer', x=355,94, y=71,50, z=262,50], sd['Bat'/320493, l='MpServer', x=302,33, y=48,00, z=213,17], uk['Spider'/320464, l='MpServer', x=320,50, y=25,00, z=285,50], tw['Creeper'/259093, l='MpServer', x=323,50, y=16,00, z=319,50], os['entity.ItemFrame.name'/315508, l='MpServer', x=355,94, y=72,50, z=262,50], os['entity.ItemFrame.name'/315505, l='MpServer', x=355,94, y=73,50, z=262,50], sd['Bat'/324206, l='MpServer', x=284,63, y=15,00, z=221,44], sd['Bat'/324209, l='MpServer', x=291,53, y=15,26, z=225,91], ui['Skeleton'/315893, l='MpServer', x=315,50, y=30,00, z=219,50], un['Zombie'/311521, l='MpServer', x=434,50, y=48,00, z=331,50], os['entity.ItemFrame.name'/119762, l='MpServer', x=344,50, y=72,50, z=254,94], os['entity.ItemFrame.name'/20685, l='MpServer', x=341,06, y=71,50, z=253,50], os['entity.ItemFrame.name'/119788, l='MpServer', x=348,50, y=72,50, z=254,94], os['entity.ItemFrame.name'/119785, l='MpServer', x=346,50, y=72,50, z=254,94], os['entity.ItemFrame.name'/20688, l='MpServer', x=341,06, y=72,50, z=253,50], os['entity.ItemFrame.name'/20518, l='MpServer', x=341,06, y=72,50, z=249,50], os['entity.ItemFrame.name'/20515, l='MpServer', x=341,06, y=71,50, z=249,50], tj['item.item.egg'/263580, l='MpServer', x=318,03, y=68,13, z=283,75], os['entity.ItemFrame.name'/20522, l='MpServer', x=341,06, y=71,50, z=251,50], un['Zombie'/315736, l='MpServer', x=408,31, y=44,00, z=316,50], os['entity.ItemFrame.name'/20502, l='MpServer', x=341,06, y=71,50, z=247,50], os['entity.ItemFrame.name'/20505, l='MpServer', x=341,06, y=72,50, z=247,50], sr['Squid'/315704, l='MpServer', x=327,50, y=62,34, z=204,09], sr['Squid'/315703, l='MpServer', x=333,88, y=60,81, z=202,81], os['entity.ItemFrame.name'/20552, l='MpServer', x=341,06, y=72,50, z=251,50], sd['Bat'/323750, l='MpServer', x=316,44, y=21,95, z=305,94], os['entity.ItemFrame.name'/214265, l='MpServer', x=343,94, y=71,50, z=277,50], uk['Spider'/316121, l='MpServer', x=322,63, y=16,00, z=321,78], sd['Bat'/286891, l='MpServer', x=361,53, y=18,10, z=185,75], ui['Skeleton'/279205, l='MpServer', x=425,91, y=15,00, z=234,50], os['entity.ItemFrame.name'/229802, l='MpServer', x=343,94, y=71,50, z=272,50], sd['Bat'/315972, l='MpServer', x=330,21, y=20,88, z=280,05], sd['Bat'/263863, l='MpServer', x=283,43, y=29,88, z=233,04], sd['Bat'/315984, l='MpServer', x=372,22, y=52,00, z=186,76], ui['Skeleton'/315920, l='MpServer', x=426,50, y=54,00, z=323,50], tw['Creeper'/315921, l='MpServer', x=427,50, y=54,00, z=322,50], sd['Bat'/315965, l='MpServer', x=320,19, y=29,80, z=288,07], so['Sheep'/7893, l='MpServer', x=377,81, y=68,00, z=292,13], so['Sheep'/7895, l='MpServer', x=384,91, y=68,00, z=298,16], so['Sheep'/7894, l='MpServer', x=384,03, y=66,00, z=255,06], so['Sheep'/7897, l='MpServer', x=318,19, y=67,00, z=287,63], so['Sheep'/7896, l='MpServer', x=376,66, y=68,00, z=301,44], so['Sheep'/7898, l='MpServer', x=332,03, y=71,00, z=234,06], so['Sheep'/7808, l='MpServer', x=393,16, y=67,00, z=269,06], so['Sheep'/7809, l='MpServer', x=389,97, y=67,00, z=274,03], sn['Pig'/7800, l='MpServer', x=389,63, y=67,00, z=242,38], sg['Cow'/7801, l='MpServer', x=372,34, y=64,00, z=219,22], so['Sheep'/7806, l='MpServer', x=360,38, y=67,00, z=305,75], so['Sheep'/7807, l='MpServer', x=389,03, y=67,00, z=257,97], so['Sheep'/7804, l='MpServer', x=350,91, y=68,00, z=219,94], so['Sheep'/7805, l='MpServer', x=386,84, y=67,00, z=258,38], sn['Pig'/7794, l='MpServer', x=387,81, y=66,00, z=251,53], sg['Cow'/7795, l='MpServer', x=386,81, y=67,00, z=240,03], sn['Pig'/7798, l='MpServer', x=387,91, y=67,00, z=240,81], sn['Pig'/7799, l='MpServer', x=390,91, y=67,00, z=242,56], sg['Cow'/7796, l='MpServer', x=322,47, y=67,00, z=236,28], sg['Cow'/7797, l='MpServer', x=389,78, y=67,00, z=249,78]]
	Retry entities: 0 total; []
	Server brand: vanilla
	Server type: Integrated singleplayer 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 (x86) version 6.2
	Java Version: 1.7.0_25, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
	Memory: 32454968 bytes (30 MB) / 271736832 bytes (259 MB) up to 518979584 bytes (494 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M
	AABB Pool Size: 1709 (95704 bytes; 0 MB) allocated, 11 (616 bytes; 0 MB) used
	IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
	Launched Version: 13w36b
	LWJGL: 2.9.0
	OpenGL: GeForce GTX 650/PCIe/SSE2 GL version 4.2.0, NVIDIA Corporation
	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)
	Vec3 Pool Size: 443 (24808 bytes; 0 MB) allocated, 64 (3584 bytes; 0 MB) used