Hopper: java.lang.NullPointerException

java.lang.NullPointerException
	at azw.a(SourceFile:188)
	at bau.a(SourceFile:159)

---- Minecraft Crash Report ----
// Don't be sad, have a hug! <3

Time: 9/7/13 3:32 PM
Description: Rendering screen

java.lang.NullPointerException
	at azw.a(SourceFile:188)
	at bau.a(SourceFile:159)
	at bho.b(SourceFile:720)
	at awb.V(SourceFile:713)
	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:188)
	at bau.a(SourceFile:159)

-- Screen render details --
Details:
	Screen name: bau
	Mouse location: Scaled: (254, 78). Absolute: (762, 512)
	Screen size: Scaled: (435, 249). Absolute: (1304, 746). Scale factor of 3

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [bfn['Valark'/77, l='MpServer', x=-1288.64, y=51.62, z=-471.17]]
	Chunk stats: MultiplayerChunkCache: 288, 288
	Level seed: 0
	Level generator: ID 01 - flat, ver 0. Features enabled: false
	Level generator options: 
	Level spawn location: World: (-1526,4,-339), Chunk: (at 10,0,13 in -96,-22; contains blocks -1536,0,-352 to -1521,255,-337), Region: (-3,-1; contains chunks -96,-32 to -65,-1, blocks -1536,0,-512 to -1025,255,-1)
	Level time: 4884035 game time, 1000 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: 101 total; [un['Zombie'/8261, l='MpServer', x=-1223.50, y=25.00, z=-422.50], us['name'/32515, l='MpServer', x=-1289.50, y=50.00, z=-473.50], ui['Skeleton'/5975, l='MpServer', x=-1212.50, y=27.00, z=-418.50], ui['Skeleton'/28453, l='MpServer', x=-1217.50, y=19.00, z=-409.50], un['Zombie'/21, l='MpServer', x=-1351.85, y=5.00, z=-422.02], un['Zombie'/20, l='MpServer', x=-1352.30, y=3.00, z=-422.70], un['Zombie'/23, l='MpServer', x=-1352.69, y=3.00, z=-421.16], un['Zombie'/22, l='MpServer', x=-1352.31, y=2.00, z=-418.47], un['Zombie'/25, l='MpServer', x=-1357.56, y=3.00, z=-420.66], un['Zombie'/24, l='MpServer', x=-1352.44, y=3.00, z=-419.41], un['Zombie'/27, l='MpServer', x=-1351.35, y=5.00, z=-420.97], un['Zombie'/26, l='MpServer', x=-1356.50, y=4.00, z=-416.91], tw['Creeper'/29, l='MpServer', x=-1358.50, y=8.00, z=-418.50], tj['item.item.sulphur'/28, l='MpServer', x=-1351.78, y=4.13, z=-419.88], sd['Bat'/34, l='MpServer', x=-1353.44, y=6.39, z=-417.50], sd['Bat'/39, l='MpServer', x=-1355.51, y=5.38, z=-420.54], un['Zombie'/36, l='MpServer', x=-1357.69, y=3.00, z=-421.69], un['Zombie'/5461, l='MpServer', x=-1351.30, y=5.00, z=-422.70], sd['Bat'/15329, l='MpServer', x=-1216.25, y=37.10, z=-421.97], ui['Skeleton'/46, l='MpServer', x=-1350.50, y=38.00, z=-419.50], un['Zombie'/47, l='MpServer', x=-1350.59, y=43.00, z=-420.03], un['Zombie'/44, l='MpServer', x=-1351.50, y=36.00, z=-417.50], os['entity.ItemFrame.name'/55, l='MpServer', x=-1352.50, y=50.50, z=-353.06], os['entity.ItemFrame.name'/54, l='MpServer', x=-1354.50, y=50.50, z=-353.06], un['Zombie'/14808, l='MpServer', x=-1356.69, y=2.00, z=-421.69], os['entity.ItemFrame.name'/59, l='MpServer', x=-1352.50, y=52.50, z=-353.06], os['entity.ItemFrame.name'/58, l='MpServer', x=-1354.50, y=52.50, z=-353.06], ui['Skeleton'/25058, l='MpServer', x=-1350.50, y=9.00, z=-417.50], os['entity.ItemFrame.name'/57, l='MpServer', x=-1354.50, y=51.50, z=-353.06], os['entity.ItemFrame.name'/56, l='MpServer', x=-1352.50, y=51.50, z=-353.06], os['entity.ItemFrame.name'/63, l='MpServer', x=-1352.50, y=54.50, z=-353.06], os['entity.ItemFrame.name'/62, l='MpServer', x=-1352.50, y=53.50, z=-353.06], os['entity.ItemFrame.name'/61, l='MpServer', x=-1354.50, y=54.50, z=-353.06], os['entity.ItemFrame.name'/60, l='MpServer', x=-1354.50, y=53.50, z=-353.06], os['entity.ItemFrame.name'/68, l='MpServer', x=-1356.06, y=53.50, z=-363.50], os['entity.ItemFrame.name'/69, l='MpServer', x=-1356.06, y=54.50, z=-364.50], os['entity.ItemFrame.name'/70, l='MpServer', x=-1356.06, y=53.50, z=-364.50], os['entity.ItemFrame.name'/71, l='MpServer', x=-1356.06, y=54.50, z=-365.50], os['entity.ItemFrame.name'/64, l='MpServer', x=-1356.06, y=53.50, z=-361.50], os['entity.ItemFrame.name'/65, l='MpServer', x=-1356.06, y=54.50, z=-362.50], os['entity.ItemFrame.name'/66, l='MpServer', x=-1356.06, y=53.50, z=-362.50], os['entity.ItemFrame.name'/67, l='MpServer', x=-1356.06, y=54.50, z=-363.50], sh['Skeleton Horse'/76, l='MpServer', x=-1333.34, y=50.00, z=-440.72], ui['Skeleton'/19070, l='MpServer', x=-1357.50, y=9.00, z=-415.50], un['Zombie'/19069, l='MpServer', x=-1359.50, y=9.00, z=-418.50], un['Zombie'/12026, l='MpServer', x=-1214.50, y=28.00, z=-429.50], os['entity.ItemFrame.name'/72, l='MpServer', x=-1356.06, y=53.50, z=-365.50], os['entity.ItemFrame.name'/73, l='MpServer', x=-1356.06, y=54.50, z=-361.50], sh['Horse'/75, l='MpServer', x=-1337.28, y=43.00, z=-443.00], un['Zombie'/26896, l='MpServer', x=-1356.50, y=31.00, z=-415.50], sd['Bat'/18342, l='MpServer', x=-1354.49, y=10.57, z=-415.49], tp['entity.MinecartRideable.name'/103, l='MpServer', x=-1277.50, y=48.06, z=-531.59], tw['Creeper'/29895, l='MpServer', x=-1353.50, y=34.00, z=-423.50], tw['Creeper'/20957, l='MpServer', x=-1354.38, y=2.00, z=-419.69], sg['Cow'/110, l='MpServer', x=-1245.97, y=51.00, z=-491.16], uj['Slime'/111, l='MpServer', x=-1226.33, y=33.05, z=-417.69], un['Zombie'/22592, l='MpServer', x=-1352.50, y=31.00, z=-414.50], sd['Bat'/115, l='MpServer', x=-1216.25, y=39.10, z=-426.75], uj['Slime'/112, l='MpServer', x=-1216.48, y=39.00, z=-426.31], us['Villager'/127, l='MpServer', x=-1211.31, y=50.00, z=-462.59], us['Villager'/126, l='MpServer', x=-1211.31, y=50.00, z=-464.53], us['Villager'/125, l='MpServer', x=-1211.31, y=50.00, z=-466.53], us['Villager'/124, l='MpServer', x=-1211.31, y=50.00, z=-468.38], ui['Skeleton'/15563, l='MpServer', x=-1357.50, y=43.00, z=-420.50], sd['Bat'/16137, l='MpServer', x=-1354.75, y=19.23, z=-416.31], tw['Creeper'/22089, l='MpServer', x=-1356.50, y=43.00, z=-415.50], un['Zombie'/33992, l='MpServer', x=-1217.50, y=28.00, z=-421.50], tw['Creeper'/28348, l='MpServer', x=-1227.50, y=36.00, z=-413.50], ui['Skeleton'/132, l='MpServer', x=-1212.50, y=31.00, z=-422.50], tw['Creeper'/29268, l='MpServer', x=-1212.50, y=21.00, z=-402.50], bfn['Valark'/77, l='MpServer', x=-1288.64, y=51.62, z=-471.17], tw['Creeper'/13738, l='MpServer', x=-1350.50, y=23.00, z=-418.00], un['Zombie'/14922, l='MpServer', x=-1351.50, y=23.00, z=-416.91], un['Zombie'/19106, l='MpServer', x=-1356.50, y=43.00, z=-421.50], ui['Skeleton'/25436, l='MpServer', x=-1220.50, y=28.00, z=-418.50], ti['Falling Block'/34021, l='MpServer', x=-1312.50, y=50.01, z=-465.50], ti['Falling Block'/34020, l='MpServer', x=-1312.50, y=49.80, z=-465.50], sd['Bat'/22917, l='MpServer', x=-1355.88, y=4.59, z=-416.46], ti['Falling Block'/34019, l='MpServer', x=-1312.50, y=49.80, z=-465.50], ti['Falling Block'/34018, l='MpServer', x=-1312.50, y=49.55, z=-465.50], ti['Falling Block'/34017, l='MpServer', x=-1312.50, y=49.51, z=-465.50], sd['Bat'/19346, l='MpServer', x=-1354.75, y=26.39, z=-421.25], sd['Bat'/20745, l='MpServer', x=-1357.13, y=39.10, z=-415.72], un['Zombie'/27124, l='MpServer', x=-1357.50, y=28.00, z=-421.50], un['Zombie'/11303, l='MpServer', x=-1350.50, y=24.00, z=-421.50], tx['Enderman'/17165, l='MpServer', x=-1354.31, y=18.62, z=-415.63], un['Zombie'/24217, l='MpServer', x=-1219.50, y=29.00, z=-423.50], un['Zombie'/16468, l='MpServer', x=-1216.50, y=41.00, z=-421.50], tw['Creeper'/25384, l='MpServer', x=-1209.50, y=27.00, z=-395.50], ui['Skeleton'/33939, l='MpServer', x=-1356.50, y=38.00, z=-415.50], sd['Bat'/33775, l='MpServer', x=-1351.25, y=4.70, z=-419.44], un['Zombie'/4337, l='MpServer', x=-1222.50, y=29.00, z=-425.50], tw['Creeper'/28950, l='MpServer', x=-1213.50, y=26.00, z=-394.50], sd['Bat'/15996, l='MpServer', x=-1358.33, y=17.01, z=-416.52], sd['Bat'/15997, l='MpServer', x=-1357.30, y=20.96, z=-419.15], ui['Skeleton'/31660, l='MpServer', x=-1358.50, y=20.00, z=-417.50], tw['Creeper'/9924, l='MpServer', x=-1350.50, y=7.00, z=-418.50], sd['Bat'/31109, l='MpServer', x=-1356.06, y=37.95, z=-417.63], sd['Bat'/2150, l='MpServer', x=-1351.00, y=26.10, z=-419.60], sd['Bat'/2898, l='MpServer', x=-1357.53, y=10.26, z=-418.59], ui['Skeleton'/31124, l='MpServer', x=-1352.50, y=14.00, z=-422.50]]
	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 7 (amd64) version 6.1
	Java Version: 1.7.0, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 264750584 bytes (252 MB) / 493682688 bytes (470 MB) up to 954466304 bytes (910 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
	AABB Pool Size: 10931 (612136 bytes; 0 MB) allocated, 1849 (103544 bytes; 0 MB) used
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	Launched Version: 13w36b
	LWJGL: 2.9.0
	OpenGL: Intel(R) HD Graphics GL version 2.1.0 - Build 8.15.10.2202, Intel
	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: 477 (26712 bytes; 0 MB) allocated, 337 (18872 bytes; 0 MB) used