Hopper: java.lang.NullPointerException: Unexpected error

java.lang.NullPointerException: Unexpected error
	at bic.a(SourceFile:481)
	at hb.a(SourceFile:47)
	at hb.a(SourceFile:12)
	at ek.a(SourceFile:146)
	at bif.e(SourceFile:209)

---- Minecraft Crash Report ----
// Quite honestly, I wouldn't worry myself about that.

Time: 11-10-13 19:36
Description: Unexpected error

java.lang.NullPointerException: Unexpected error
	at bic.a(SourceFile:481)
	at hb.a(SourceFile:47)
	at hb.a(SourceFile:12)
	at ek.a(SourceFile:146)
	at bif.e(SourceFile:209)
	at ayp.o(SourceFile:1281)
	at ayp.ab(SourceFile:755)
	at ayp.e(SourceFile:706)
	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 bic.a(SourceFile:481)
	at hb.a(SourceFile:47)
	at hb.a(SourceFile:12)
	at ek.a(SourceFile:146)
	at bif.e(SourceFile:209)

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [bil['ElektroCreeper3'/348, l='MpServer', x=-239,49, y=87,03, z=233,46]]
	Chunk stats: MultiplayerChunkCache: 348, 348
	Level seed: 0
	Level generator: ID 00 - default, ver 1. Features enabled: false
	Level generator options: 
	Level spawn location: World: (-239,65,255), Chunk: (at 1,4,15 in -15,15; contains blocks -240,0,240 to -225,255,255), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
	Level time: 1410556 game time, 14654 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: 61 total; [bil['ElektroCreeper3'/348, l='MpServer', x=-244,70, y=55,62, z=311,70], ur['Pig'/141, l='MpServer', x=-253,97, y=69,00, z=181,88], vu['entity.MinecartHopper.name'/143, l='MpServer', x=-248,50, y=62,34, z=299,50], ur['Pig'/142, l='MpServer', x=-210,13, y=67,00, z=217,06], ur['Pig'/129, l='MpServer', x=-289,81, y=68,00, z=222,78], uh['Bat'/2165055, l='MpServer', x=-186,97, y=15,00, z=300,13], vp['entity.MinecartChest.name'/128, l='MpServer', x=-265,50, y=5,34, z=232,38], us['Sheep'/157, l='MpServer', x=-268,78, y=71,00, z=200,44], uh['Bat'/2206049, l='MpServer', x=-265,24, y=56,22, z=267,10], uh['Bat'/2206050, l='MpServer', x=-284,80, y=54,48, z=266,26], uh['Bat'/2152178, l='MpServer', x=-251,75, y=39,10, z=185,31], uh['Bat'/2206052, l='MpServer', x=-288,50, y=54,19, z=261,06], uh['Bat'/2191164, l='MpServer', x=-267,78, y=37,26, z=304,31], ur['Pig'/171, l='MpServer', x=-228,16, y=67,00, z=251,35], uh['Bat'/2206043, l='MpServer', x=-274,25, y=39,79, z=237,56], ur['Pig'/170, l='MpServer', x=-234,13, y=68,00, z=218,91], ur['Pig'/174, l='MpServer', x=-210,84, y=69,00, z=296,97], uh['Bat'/2191162, l='MpServer', x=-262,73, y=52,71, z=275,46], bkk['Jellypudding'/2010817, l='MpServer', x=-236,50, y=66,00, z=250,50], uh['Bat'/2201546, l='MpServer', x=-183,72, y=36,12, z=231,93], uh['Bat'/2201543, l='MpServer', x=-186,31, y=33,26, z=239,86], bkk['Jellypudding'/1288304, l='MpServer', x=-247,53, y=63,59, z=302,31], uh['Bat'/2201542, l='MpServer', x=-282,30, y=37,05, z=278,72], uh['Bat'/2152027, l='MpServer', x=-274,17, y=61,78, z=277,28], bkk['Jellypudding'/2010817, l='MpServer', x=-233,13, y=52,00, z=283,63], ur['Pig'/69, l='MpServer', x=-307,69, y=67,00, z=251,88], ur['Pig'/70, l='MpServer', x=-304,88, y=68,00, z=244,25], ur['Pig'/71, l='MpServer', x=-317,19, y=69,00, z=244,69], bkk['Jellypudding'/1288304, l='MpServer', x=-242,94, y=54,00, z=310,22], ur['Pig'/67, l='MpServer', x=-313,03, y=69,00, z=167,91], uj['Chicken'/79, l='MpServer', x=-290,50, y=78,00, z=193,50], vp['entity.MinecartChest.name'/72, l='MpServer', x=-313,50, y=9,34, z=261,50], bkk['Jellypudding'/1288304, l='MpServer', x=-233,09, y=52,00, z=283,66], ur['Pig'/85, l='MpServer', x=-276,94, y=69,00, z=213,09], vp['entity.MinecartChest.name'/84, l='MpServer', x=-297,50, y=4,50, z=219,88], ur['Pig'/87, l='MpServer', x=-292,88, y=67,00, z=266,97], us['Sheep'/86, l='MpServer', x=-301,88, y=65,00, z=234,84], uj['Chicken'/81, l='MpServer', x=-290,50, y=78,00, z=193,50], vn['item.item.egg'/2071629, l='MpServer', x=-302,97, y=65,13, z=279,66], uj['Chicken'/80, l='MpServer', x=-288,50, y=76,00, z=192,50], uh['Bat'/2191170, l='MpServer', x=-287,09, y=55,40, z=265,45], uj['Chicken'/89, l='MpServer', x=-301,63, y=65,00, z=279,59], ur['Pig'/88, l='MpServer', x=-304,56, y=66,00, z=261,31], vn['item.item.egg'/2086895, l='MpServer', x=-302,66, y=64,13, z=276,84], uj['Chicken'/91, l='MpServer', x=-299,56, y=66,00, z=276,47], uh['Bat'/2217494, l='MpServer', x=-267,25, y=34,54, z=243,41], ur['Pig'/101, l='MpServer', x=-279,69, y=68,00, z=227,19], ur['Pig'/98, l='MpServer', x=-280,94, y=68,00, z=219,41], uh['Bat'/2211188, l='MpServer', x=-301,10, y=22,03, z=244,99], ur['Pig'/99, l='MpServer', x=-283,84, y=67,00, z=230,47], ur['Pig'/97, l='MpServer', x=-272,69, y=69,00, z=214,50], uh['Bat'/2177937, l='MpServer', x=-302,98, y=15,91, z=245,54], uh['Bat'/2217499, l='MpServer', x=-319,78, y=37,60, z=249,89], uh['Bat'/2217498, l='MpServer', x=-306,98, y=39,78, z=250,09], bil['ElektroCreeper3'/348, l='MpServer', x=-239,49, y=87,03, z=233,46], bkk['Jellypudding'/1288304, l='MpServer', x=-340,01, y=63,00, z=167,03], uv['Squid'/2198375, l='MpServer', x=-302,50, y=59,00, z=292,50], ur['Pig'/127, l='MpServer', x=-274,63, y=69,00, z=215,06], ur['Pig'/126, l='MpServer', x=-275,44, y=68,00, z=216,63], ur['Pig'/125, l='MpServer', x=-227,69, y=68,00, z=211,81], ur['Pig'/124, l='MpServer', x=-265,88, y=69,00, z=181,97]]
	Retry entities: 0 total; []
	Server brand: vanilla
	Server type: Non-integrated multiplayer server
Stacktrace:
	at big.a(SourceFile:302)
	at ayp.b(SourceFile:1935)
	at ayp.e(SourceFile:720)
	at net.minecraft.client.main.Main.main(SourceFile:103)

-- System Details --
Details:
	Minecraft Version: 13w41b
	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: 15738144 bytes (15 MB) / 137035776 bytes (130 MB) up to 954466304 bytes (910 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
	AABB Pool Size: 1495 (83720 bytes; 0 MB) allocated, 2 (112 bytes; 0 MB) used
	IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
	Launched Version: 13w41b
	LWJGL: 2.9.0
	OpenGL: AMD Radeon HD 6670 GL version 4.2.12217 Compatibility Profile Context 12.104.0.0, ATI Technologies Inc.
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Packs: [Faithful 64x64.zip]
	Current Language: English (US)
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 947 (53032 bytes; 0 MB) allocated, 16 (896 bytes; 0 MB) used
	Anisotropic Filtering: On (4)