Hopper: java.lang.NullPointerException

java.lang.NullPointerException
	at awy.a(SourceFile:441)
	at awe.d(SourceFile:135)
	at axm.d(SourceFile:488)
	at awe.m(SourceFile:107)

---- Minecraft Crash Report ----
// Daisy, daisy...

Time: 19.09.13 19:33
Description: Updating screen events

java.lang.NullPointerException
	at awy.a(SourceFile:441)
	at awe.d(SourceFile:135)
	at axm.d(SourceFile:488)
	at awe.m(SourceFile:107)
	at atv.k(SourceFile:1158)
	at atv.S(SourceFile:663)
	at atv.d(SourceFile:619)
	at net.minecraft.client.main.Main.main(SourceFile:101)


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

-- Head --
Stacktrace:
	at awy.a(SourceFile:441)
	at awe.d(SourceFile:135)
	at axm.d(SourceFile:488)
	at awe.m(SourceFile:107)

-- Affected screen --
Details:
	Screen name: axm

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [bdi['Yoyo_Geschonneck'/35, l='MpServer', x=-833,30, y=-218,67, z=-256,30]]
	Chunk stats: MultiplayerChunkCache: 441
	Level seed: 0
	Level generator: ID 01 - flat, ver 0. Features enabled: false
	Level generator options: 
	Level spawn location: World: (-899,4,-326), Chunk: (at 13,0,10 in -57,-21; contains blocks -912,0,-336 to -897,255,-321), Region: (-2,-1; contains chunks -64,-32 to -33,-1, blocks -1024,0,-512 to -513,255,-1)
	Level time: 525731 game time, 736779 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: 49 total; [ub['bestrafter Gefangener'/126224, l='MpServer', x=-852,81, y=11,00, z=-267,16], ry['Schwein'/17, l='MpServer', x=-903,50, y=4,00, z=-255,88], rz['Schaf'/16, l='MpServer', x=-913,13, y=4,00, z=-227,06], ry['Schwein'/19, l='MpServer', x=-902,25, y=4,00, z=-244,56], rz['Schaf'/18, l='MpServer', x=-903,75, y=4,00, z=-249,63], rz['Schaf'/21, l='MpServer', x=-905,16, y=4,00, z=-236,34], ss['item.tile.stoneSlab.stone'/298327, l='MpServer', x=-833,31, y=-212,22, z=-256,31], bdi['Yoyo_Geschonneck'/35, l='MpServer', x=-833,30, y=-218,67, z=-256,30], ub['bestrafter Gefangener'/126208, l='MpServer', x=-850,81, y=11,00, z=-267,31], rz['Schaf'/20, l='MpServer', x=-907,84, y=4,00, z=-231,16], ss['item.tile.stoneMoss'/298326, l='MpServer', x=-833,31, y=-212,22, z=-256,31], ry['Schwein'/22, l='MpServer', x=-864,94, y=4,00, z=-308,25], ss['item.item.skull.skeleton'/298331, l='MpServer', x=-833,31, y=-212,22, z=-256,31], ss['item.tile.stonebricksmooth.mossy'/298330, l='MpServer', x=-833,31, y=-212,22, z=-256,31], ry['Schwein'/27, l='MpServer', x=-862,25, y=4,00, z=-309,88], ss['item.tile.stoneSlab.cobble'/298329, l='MpServer', x=-833,31, y=-212,22, z=-256,31], ss['item.tile.stoneSlab.smoothStoneBrick'/298328, l='MpServer', x=-833,31, y=-212,22, z=-256,31], ss['item.tile.thinGlass'/298335, l='MpServer', x=-833,31, y=-212,22, z=-256,31], rr['Kuh'/29, l='MpServer', x=-869,31, y=4,00, z=-287,22], ss['item.item.sign'/298334, l='MpServer', x=-833,31, y=-212,22, z=-256,31], ry['Schwein'/28, l='MpServer', x=-834,03, y=4,00, z=-226,88], ss['item.item.doorIron'/298333, l='MpServer', x=-833,31, y=-212,22, z=-256,31], rz['Schaf'/31, l='MpServer', x=-791,06, y=4,00, z=-266,06], ss['item.tile.pressurePlate'/298332, l='MpServer', x=-833,31, y=-212,22, z=-256,31], rz['Schaf'/30, l='MpServer', x=-816,91, y=4,00, z=-314,09], ss['item.tile.button'/298336, l='MpServer', x=-833,31, y=-212,22, z=-256,31], ss['item.tile.torch'/298337, l='MpServer', x=-833,31, y=-212,22, z=-256,31], ss['item.tile.stairsStone'/298338, l='MpServer', x=-833,31, y=-212,22, z=-256,31], rz['Schaf'/32, l='MpServer', x=-791,75, y=4,00, z=-249,16], ss['item.tile.vine'/298339, l='MpServer', x=-833,31, y=-212,22, z=-256,31], ub['Snoxs'/22985, l='MpServer', x=-869,03, y=5,00, z=-261,44], ss['item.item.bed'/298340, l='MpServer', x=-833,31, y=-212,22, z=-256,31], ss['item.tile.anvil.intact'/298341, l='MpServer', x=-833,31, y=-212,22, z=-256,31], ss['item.tile.torch'/298342, l='MpServer', x=-833,31, y=-212,22, z=-256,31], ss['item.tile.anvil.intact'/298343, l='MpServer', x=-833,31, y=-212,22, z=-256,31], ss['item.tile.web'/298344, l='MpServer', x=-833,31, y=-212,22, z=-256,31], ss['item.tile.cobbleWall.normal'/298345, l='MpServer', x=-833,31, y=-212,22, z=-256,31], ss['item.tile.monsterStoneEgg.brick'/298346, l='MpServer', x=-833,31, y=-212,22, z=-256,31], ss['item.tile.stonebricksmooth.mossy'/298347, l='MpServer', x=-833,31, y=-212,22, z=-256,31], ss['item.item.bucketLava'/298348, l='MpServer', x=-833,31, y=-212,22, z=-256,31], ss['item.tile.pressurePlate'/298349, l='MpServer', x=-833,31, y=-212,22, z=-256,31], ss['item.item.monsterPlacer'/298350, l='MpServer', x=-833,31, y=-212,22, z=-256,31], ss['item.tile.chestTrap'/298351, l='MpServer', x=-833,31, y=-212,22, z=-256,31], ss['item.tile.dispenser'/298353, l='MpServer', x=-833,31, y=-212,22, z=-256,31], ub['bestrafter Gefangener'/126442, l='MpServer', x=-851,63, y=11,00, z=-267,63], ss['item.tile.fenceIron'/298352, l='MpServer', x=-833,31, y=-212,22, z=-256,31], ss['item.tile.stonebricksmooth.chiseled'/298355, l='MpServer', x=-833,31, y=-212,22, z=-256,31], ss['item.item.skull.skeleton'/298354, l='MpServer', x=-833,31, y=-212,22, z=-256,31], ss['item.tile.stonebricksmooth.cracked'/298356, l='MpServer', x=-833,31, y=-212,22, z=-256,31]]
	Retry entities: 0 total; []
	Server brand: vanilla
	Server type: Integrated singleplayer server
Stacktrace:
	at bdd.a(SourceFile:284)
	at atv.b(SourceFile:1761)
	at atv.d(SourceFile:628)
	at net.minecraft.client.main.Main.main(SourceFile:101)

-- System Details --
Details:
	Minecraft Version: 1.6.4
	Operating System: Windows 7 (x86) version 6.1
	Java Version: 1.7.0_25, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
	Memory: 114180912 bytes (108 MB) / 369762304 bytes (352 MB) up to 518979584 bytes (494 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M
	AABB Pool Size: 2067 (115752 bytes; 0 MB) allocated, 2 (112 bytes; 0 MB) used
	Suspicious classes: No suspicious classes found.
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	Launched Version: 1.6.4
	LWJGL: 2.9.0
	OpenGL: Mobile Intel(R) 4 Series Express Chipset Family GL version 2.1.0 - Build 8.15.10.1892, Intel
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Pack: Sphax PureBDcraft 32x MC15.zip
	Current Language: Deutsch (Deutschland)
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 135 (7560 bytes; 0 MB) allocated, 11 (616 bytes; 0 MB) used