Hopper: java.lang.NullPointerException

java.lang.NullPointerException
	at azw.a(SourceFile:441)
	at ayw.d(SourceFile:146)
	at ayw.m(SourceFile:110)

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

Time: 9/6/13 3:19 PM
Description: Updating screen events

java.lang.NullPointerException
	at azw.a(SourceFile:441)
	at ayw.d(SourceFile:146)
	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 azw.a(SourceFile:441)
	at ayw.d(SourceFile:146)
	at ayw.m(SourceFile:110)

-- Affected screen --
Details:
	Screen name: bah

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [bfn['Player'/3862, l='MpServer', x=-17.68, y=69.62, z=-62.47]]
	Chunk stats: MultiplayerChunkCache: 320, 320
	Level seed: 0
	Level generator: ID 00 - default, ver 1. Features enabled: false
	Level generator options: 
	Level spawn location: World: (-20,64,-60), Chunk: (at 12,4,4 in -2,-4; contains blocks -32,0,-64 to -17,255,-49), Region: (-1,-1; contains chunks -32,-32 to -1,-1, blocks -512,0,-512 to -1,255,-1)
	Level time: 5700 game time, 679 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: 131 total; [un['Zombie'/5979, l='MpServer', x=-12.50, y=25.00, z=4.50], tj['item.item.seeds'/3827, l='MpServer', x=16.19, y=63.13, z=-37.31], so['Sheep'/3830, l='MpServer', x=34.50, y=64.00, z=-90.50], ui['Skeleton'/7048, l='MpServer', x=-1.50, y=59.00, z=-106.50], sd['Bat'/7669, l='MpServer', x=-16.63, y=24.85, z=-45.53], tw['Creeper'/3811, l='MpServer', x=27.03, y=52.00, z=-67.38], sd['Bat'/7668, l='MpServer', x=-25.56, y=24.19, z=-47.56], sd['Bat'/7671, l='MpServer', x=-2.13, y=28.95, z=-29.91], ui['Skeleton'/7069, l='MpServer', x=-42.50, y=22.00, z=-125.50], sr['Squid'/5481, l='MpServer', x=-60.88, y=53.06, z=-21.69], so['Sheep'/3815, l='MpServer', x=-4.91, y=68.00, z=-64.03], un['Zombie'/6591, l='MpServer', x=9.50, y=37.00, z=-50.50], tj['item.item.sulphur'/3818, l='MpServer', x=6.66, y=31.13, z=-21.94], tj['item.item.seeds'/3817, l='MpServer', x=8.13, y=63.13, z=-41.88], so['Sheep'/3816, l='MpServer', x=10.06, y=66.00, z=-55.06], ui['Skeleton'/7056, l='MpServer', x=-77.50, y=57.00, z=-68.50], ui['Skeleton'/6787, l='MpServer', x=-34.50, y=20.00, z=-23.50], un['Zombie'/6537, l='MpServer', x=-75.50, y=12.00, z=-56.50], tw['Creeper'/7618, l='MpServer', x=-80.50, y=54.00, z=-124.50], uk['Spider'/7617, l='MpServer', x=-77.97, y=54.00, z=-124.63], un['Zombie'/6541, l='MpServer', x=6.13, y=40.00, z=-63.22], sd['Bat'/3807, l='MpServer', x=16.59, y=52.10, z=-80.53], so['Sheep'/3781, l='MpServer', x=-15.22, y=67.00, z=-121.28], so['Sheep'/3780, l='MpServer', x=-14.25, y=66.00, z=-119.03], so['Sheep'/3782, l='MpServer', x=-9.16, y=66.00, z=-117.91], tj['item.item.seeds'/3787, l='MpServer', x=-2.19, y=68.13, z=-69.59], tj['item.item.seeds'/3786, l='MpServer', x=-5.84, y=67.13, z=-72.34], un['Zombie'/7643, l='MpServer', x=-51.50, y=53.00, z=-92.50], so['Sheep'/3789, l='MpServer', x=-23.81, y=69.00, z=-75.66], tw['Creeper'/7642, l='MpServer', x=-45.50, y=53.00, z=-89.50], so['Sheep'/3788, l='MpServer', x=19.78, y=66.00, z=-62.63], tw['Creeper'/6872, l='MpServer', x=-72.88, y=5.00, z=-24.25], tw['Creeper'/7115, l='MpServer', x=-40.50, y=20.00, z=-101.50], so['Sheep'/3764, l='MpServer', x=-29.16, y=68.00, z=-120.84], un['Zombie'/7113, l='MpServer', x=36.50, y=17.00, z=14.50], so['Sheep'/3765, l='MpServer', x=-17.19, y=65.00, z=-112.91], so['Sheep'/3762, l='MpServer', x=-17.72, y=66.00, z=-115.41], so['Sheep'/3763, l='MpServer', x=-22.69, y=66.00, z=-112.34], tw['Creeper'/7116, l='MpServer', x=-40.00, y=20.00, z=-100.13], tw['Creeper'/7117, l='MpServer', x=-39.69, y=20.00, z=-98.31], so['Sheep'/3761, l='MpServer', x=-20.06, y=66.00, z=-113.03], un['Zombie'/6865, l='MpServer', x=-55.50, y=39.00, z=-128.50], un['Zombie'/6864, l='MpServer', x=-55.06, y=40.00, z=-127.50], un['Zombie'/7599, l='MpServer', x=-84.50, y=40.00, z=-135.50], tw['Creeper'/7600, l='MpServer', x=10.50, y=15.00, z=-72.50], tw['Creeper'/6648, l='MpServer', x=-9.50, y=23.00, z=9.50], un['Zombie'/7132, l='MpServer', x=-25.50, y=27.00, z=-4.50], sd['Bat'/6605, l='MpServer', x=38.17, y=16.37, z=15.66], tw['Creeper'/7558, l='MpServer', x=25.50, y=29.00, z=15.50], un['Zombie'/6910, l='MpServer', x=-9.22, y=39.00, z=-34.41], ui['Skeleton'/7323, l='MpServer', x=2.50, y=39.00, z=-75.50], tw['Creeper'/4445, l='MpServer', x=-53.50, y=53.00, z=-131.50], un['Zombie'/7325, l='MpServer', x=1.50, y=39.00, z=-79.50], un['Zombie'/7324, l='MpServer', x=0.50, y=39.00, z=-76.50], uj['Slime'/3737, l='MpServer', x=-38.16, y=29.41, z=-99.63], tw['Creeper'/7327, l='MpServer', x=35.50, y=19.00, z=-57.50], tw['Creeper'/6354, l='MpServer', x=-33.50, y=27.00, z=-108.50], tj['item.item.seeds'/7296, l='MpServer', x=-3.50, y=66.13, z=-75.13], tw['Creeper'/6894, l='MpServer', x=16.50, y=33.00, z=-79.50], tw['Creeper'/6895, l='MpServer', x=8.94, y=34.00, z=-74.53], un['Zombie'/6618, l='MpServer', x=-46.50, y=22.00, z=-133.50], sn['Pig'/3725, l='MpServer', x=-57.25, y=64.00, z=-62.88], so['Sheep'/3724, l='MpServer', x=-63.88, y=65.00, z=-57.78], sd['Bat'/7306, l='MpServer', x=7.59, y=34.67, z=-76.59], sd['Bat'/7307, l='MpServer', x=9.78, y=38.67, z=-74.88], sn['Pig'/3726, l='MpServer', x=-59.72, y=63.00, z=-64.53], sd['Bat'/7582, l='MpServer', x=-35.61, y=20.83, z=-22.21], sn['Pig'/3720, l='MpServer', x=-62.81, y=64.00, z=-62.38], sd['Bat'/7581, l='MpServer', x=-31.66, y=15.79, z=-13.68], so['Sheep'/3723, l='MpServer', x=-66.66, y=63.00, z=-65.84], so['Sheep'/3722, l='MpServer', x=-51.31, y=62.00, z=-63.84], ui['Skeleton'/7768, l='MpServer', x=-11.50, y=26.00, z=-27.50], tw['Creeper'/7771, l='MpServer', x=-88.86, y=14.00, z=-71.77], ui['Skeleton'/6916, l='MpServer', x=-39.50, y=15.00, z=-135.50], tw['Creeper'/7772, l='MpServer', x=-88.67, y=14.00, z=-72.69], un['Zombie'/6912, l='MpServer', x=-59.50, y=67.00, z=-100.50], tj['item.item.stick'/7761, l='MpServer', x=-18.13, y=68.13, z=-61.34], tw['Creeper'/7287, l='MpServer', x=-72.00, y=17.00, z=-138.50], ui['Skeleton'/7284, l='MpServer', x=-52.50, y=23.00, z=-114.50], un['Zombie'/7285, l='MpServer', x=-58.50, y=23.00, z=-118.50], ui['Skeleton'/7283, l='MpServer', x=-57.50, y=23.00, z=-117.50], un['Zombie'/7767, l='MpServer', x=-11.50, y=26.00, z=-28.50], ui['Skeleton'/7551, l='MpServer', x=35.55, y=11.58, z=-25.58], ui['Skeleton'/6657, l='MpServer', x=-42.50, y=21.00, z=-103.50], ui['Skeleton'/6455, l='MpServer', x=-33.50, y=24.00, z=14.50], un['Zombie'/6671, l='MpServer', x=-26.63, y=48.00, z=-122.50], sd['Bat'/7265, l='MpServer', x=21.16, y=51.67, z=-78.56], tj['item.tile.wood.oak'/7802, l='MpServer', x=-17.69, y=69.31, z=-62.50], sd['Bat'/7263, l='MpServer', x=19.50, y=55.20, z=-88.88], tw['Creeper'/5054, l='MpServer', x=0.50, y=63.00, z=-89.50], un['Zombie'/6134, l='MpServer', x=0.78, y=54.00, z=-20.44], sr['Squid'/7494, l='MpServer', x=13.50, y=61.78, z=-28.50], sr['Squid'/7493, l='MpServer', x=9.03, y=60.19, z=-23.50], sr['Squid'/7492, l='MpServer', x=6.75, y=62.38, z=-19.41], sr['Squid'/7491, l='MpServer', x=11.06, y=62.34, z=-21.31], sr['Squid'/7490, l='MpServer', x=33.78, y=51.84, z=-15.91], un['Zombie'/5040, l='MpServer', x=37.41, y=41.00, z=-37.06], tj['item.tile.wood.oak'/7796, l='MpServer', x=-18.10, y=68.21, z=-61.38], sr['Squid'/7489, l='MpServer', x=23.50, y=50.38, z=-10.47], sr['Squid'/7488, l='MpServer', x=20.50, y=53.00, z=-9.50], un['Zombie'/7784, l='MpServer', x=10.50, y=40.00, z=-56.50], tw['Creeper'/7240, l='MpServer', x=-49.50, y=20.00, z=-78.50], tw['Creeper'/7239, l='MpServer', x=-49.50, y=20.00, z=-81.50], un['Zombie'/7783, l='MpServer', x=4.50, y=40.00, z=-61.50], un['Zombie'/7780, l='MpServer', x=22.50, y=21.00, z=-68.50], ui['Skeleton'/7700, l='MpServer', x=20.50, y=22.00, z=-78.50], sr['Squid'/7457, l='MpServer', x=43.22, y=44.09, z=-15.38], ui['Skeleton'/7701, l='MpServer', x=21.50, y=22.00, z=-78.50], un['Zombie'/7702, l='MpServer', x=13.53, y=23.00, z=-68.97], ui['Skeleton'/7699, l='MpServer', x=19.50, y=22.00, z=-78.50], ui['Skeleton'/6721, l='MpServer', x=-37.50, y=52.00, z=-100.50], ui['Skeleton'/6720, l='MpServer', x=-36.50, y=52.00, z=-100.50], sd['Bat'/7208, l='MpServer', x=26.16, y=29.04, z=15.40], sd['Bat'/7689, l='MpServer', x=-77.25, y=52.00, z=-130.25], sd['Bat'/5301, l='MpServer', x=9.80, y=41.85, z=-79.23], sd['Bat'/7690, l='MpServer', x=-81.78, y=50.79, z=-133.50], sr['Squid'/7487, l='MpServer', x=25.63, y=51.41, z=-9.16], sd['Bat'/7207, l='MpServer', x=28.29, y=29.05, z=13.11], tw['Creeper'/7006, l='MpServer', x=-38.50, y=18.00, z=-77.50], tw['Creeper'/7007, l='MpServer', x=-40.50, y=18.00, z=-76.50], tw['Creeper'/7004, l='MpServer', x=-41.50, y=18.00, z=-77.50], ui['Skeleton'/7742, l='MpServer', x=-3.50, y=42.00, z=9.50], sr['Squid'/5523, l='MpServer', x=-67.78, y=56.31, z=-45.81], tj['item.tile.flower2.houstonia'/4293, l='MpServer', x=4.44, y=63.13, z=-22.88], tw['Creeper'/7177, l='MpServer', x=18.91, y=54.00, z=-91.22], un['Zombie'/6208, l='MpServer', x=-51.50, y=23.00, z=-114.50], sd['Bat'/7032, l='MpServer', x=-50.27, y=43.00, z=-104.51], bfn['Player'/3862, l='MpServer', x=-17.68, y=69.62, z=-62.47], sr['Squid'/7444, l='MpServer', x=42.16, y=55.19, z=-112.56], un['Zombie'/7175, l='MpServer', x=15.97, y=56.00, z=-91.50], sr['Squid'/7445, l='MpServer', x=46.31, y=55.63, z=-108.13]]
	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: Mac OS X (x86_64) version 10.8.4
	Java Version: 1.6.0_51, Apple Inc.
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
	Memory: 60480008 bytes (57 MB) / 264646656 bytes (252 MB) up to 1060372480 bytes (1011 MB)
	JVM Flags: 1 total; -Xmx1G
	AABB Pool Size: 1675 (93800 bytes; 0 MB) allocated, 2 (112 bytes; 0 MB) used
	IntCache: cache: 0, tcache: 0, allocated: 12, tallocated: 94
	Launched Version: 13w36b
	LWJGL: 2.9.0
	OpenGL: AMD Radeon HD 6970M OpenGL Engine GL version 2.1 ATI-1.8.18, ATI Technologies Inc.
	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: 2789 (156184 bytes; 0 MB) allocated, 29 (1624 bytes; 0 MB) used