Hopper: java.lang.NullPointerException

java.lang.NullPointerException
	at aey.a(SourceFile:927)
	at act.a(SourceFile:100)
	at adi.a(SourceFile:166)
	at aqm.c(SourceFile:73)
	at bhv.p(SourceFile:3783)
	at bhv.b(SourceFile:122)
	at bhd.a(SourceFile:158)
	at bho.a(SourceFile:1132)
	at bhh.a(SourceFile:817)

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

Time: 9/6/13 10:30 AM
Description: Unexpected error

java.lang.NullPointerException
	at aey.a(SourceFile:927)
	at act.a(SourceFile:100)
	at adi.a(SourceFile:166)
	at aqm.c(SourceFile:73)
	at bhv.p(SourceFile:3783)
	at bhv.b(SourceFile:122)
	at bhd.a(SourceFile:158)
	at bho.a(SourceFile:1132)
	at bhh.a(SourceFile:817)
	at bhh.b(SourceFile:695)
	at avx.V(SourceFile:713)
	at avx.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 aey.a(SourceFile:927)
	at act.a(SourceFile:100)
	at adi.a(SourceFile:166)
	at aqm.c(SourceFile:73)
	at bhv.p(SourceFile:3783)
	at bhv.b(SourceFile:122)
	at bhd.a(SourceFile:158)
	at bho.a(SourceFile:1132)
	at bhh.a(SourceFile:817)

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [bfg['Cloaking_Ocean'/124, l='MpServer', x=-163.50, y=68.62, z=246.50]]
	Chunk stats: MultiplayerChunkCache: 5, 5
	Level seed: 0
	Level generator: ID 00 - default, ver 1. Features enabled: false
	Level generator options: 
	Level spawn location: World: (-160,64,256), Chunk: (at 0,4,0 in -10,16; contains blocks -160,0,256 to -145,255,271), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
	Level time: 9822 game time, 9822 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: 12 total; [bfg['Cloaking_Ocean'/124, l='MpServer', x=326.76, y=71.62, z=-306.52], un['Zombie'/185, l='MpServer', x=259.50, y=17.00, z=-354.50], tw['Creeper'/190, l='MpServer', x=264.50, y=19.00, z=-344.50], tw['Creeper'/191, l='MpServer', x=261.50, y=19.00, z=-345.50], ui['Skeleton'/188, l='MpServer', x=269.50, y=16.00, z=-355.50], un['Zombie'/189, l='MpServer', x=267.50, y=16.00, z=-352.50], sd['Bat'/176, l='MpServer', x=245.37, y=16.33, z=-234.50], ui['Skeleton'/182, l='MpServer', x=257.50, y=18.00, z=-357.50], ui['Skeleton'/183, l='MpServer', x=261.50, y=18.00, z=-360.50], tw['Creeper'/181, l='MpServer', x=257.50, y=45.00, z=-385.50], ui['Skeleton'/205, l='MpServer', x=274.50, y=18.00, z=-341.50], bfg['Cloaking_Ocean'/124, l='MpServer', x=-163.50, y=68.62, z=246.50]]
	Retry entities: 47 total; [ui['Skeleton'/204, l='MpServer', x=275.50, y=60.00, z=-363.50], un['Zombie'/207, l='MpServer', x=280.50, y=57.00, z=-344.50], sd['Bat'/206, l='MpServer', x=284.14, y=26.57, z=-345.92], ui['Skeleton'/201, l='MpServer', x=276.50, y=60.00, z=-365.50], tw['Creeper'/200, l='MpServer', x=279.50, y=44.00, z=-354.50], ui['Skeleton'/203, l='MpServer', x=277.50, y=60.00, z=-365.50], ui['Skeleton'/202, l='MpServer', x=277.50, y=60.00, z=-367.50], ui['Skeleton'/197, l='MpServer', x=277.42, y=34.00, z=-381.49], ui['Skeleton'/196, l='MpServer', x=276.39, y=34.00, z=-381.50], un['Zombie'/199, l='MpServer', x=276.50, y=52.00, z=-377.50], un['Zombie'/198, l='MpServer', x=276.50, y=52.00, z=-378.50], sf['Chicken'/192, l='MpServer', x=271.53, y=67.00, z=-241.44], tx['Enderman'/220, l='MpServer', x=304.60, y=23.00, z=-374.15], un['Zombie'/221, l='MpServer', x=307.50, y=24.00, z=-376.50], ui['Skeleton'/222, l='MpServer', x=313.50, y=46.00, z=-323.50], tj['item.item.reeds'/223, l='MpServer', x=319.41, y=69.13, z=-307.38], sd['Bat'/216, l='MpServer', x=294.97, y=28.00, z=-345.32], tw['Creeper'/217, l='MpServer', x=303.50, y=26.00, z=-250.50], sd['Bat'/218, l='MpServer', x=298.60, y=22.40, z=-238.89], sd['Bat'/219, l='MpServer', x=299.25, y=17.94, z=-234.19], tx['Enderman'/212, l='MpServer', x=300.34, y=24.00, z=-376.03], ui['Skeleton'/213, l='MpServer', x=292.50, y=12.00, z=-344.50], ui['Skeleton'/214, l='MpServer', x=293.50, y=12.00, z=-343.50], sd['Bat'/215, l='MpServer', x=296.40, y=24.00, z=-349.53], sf['Chicken'/208, l='MpServer', x=272.53, y=67.00, z=-243.47], sf['Chicken'/210, l='MpServer', x=275.50, y=68.00, z=-235.50], sf['Chicken'/211, l='MpServer', x=287.38, y=68.00, z=-236.56], sf['Chicken'/231, l='MpServer', x=305.50, y=68.00, z=-236.50], un['Zombie'/380, l='MpServer', x=341.34, y=16.00, z=-263.66], sf['Chicken'/230, l='MpServer', x=307.50, y=68.00, z=-239.50], sf['Chicken'/229, l='MpServer', x=309.50, y=68.00, z=-239.50], sf['Chicken'/228, l='MpServer', x=311.47, y=68.00, z=-250.44], ui['Skeleton'/377, l='MpServer', x=339.50, y=16.00, z=-263.50], tw['Creeper'/227, l='MpServer', x=304.50, y=26.00, z=-246.50], un['Zombie'/226, l='MpServer', x=304.50, y=26.00, z=-255.50], un['Zombie'/379, l='MpServer', x=341.34, y=16.00, z=-262.66], un['Zombie'/225, l='MpServer', x=305.50, y=26.00, z=-253.50], ui['Skeleton'/378, l='MpServer', x=339.22, y=15.00, z=-261.22], ui['Skeleton'/224, l='MpServer', x=311.50, y=43.00, z=-266.50], sd['Bat'/248, l='MpServer', x=336.25, y=15.60, z=-255.12], ui['Skeleton'/246, l='MpServer', x=344.50, y=19.00, z=-362.50], tj['item.tile.sand'/127, l='MpServer', x=326.72, y=70.13, z=-308.59], sd['Bat'/247, l='MpServer', x=340.31, y=17.10, z=-259.25], tj['item.tile.flower2.houstonia'/126, l='MpServer', x=324.94, y=69.13, z=-306.25], ui['Skeleton'/244, l='MpServer', x=348.50, y=21.00, z=-375.50], tj['item.tile.flower2.oxeyeDaisy'/125, l='MpServer', x=328.56, y=70.13, z=-304.31], tw['Creeper'/245, l='MpServer', x=350.50, y=34.00, z=-373.50]]
	Server brand: vanilla
	Server type: Integrated singleplayer server
Stacktrace:
	at bfb.a(SourceFile:285)
	at avx.b(SourceFile:1813)
	at avx.e(SourceFile:656)
	at net.minecraft.client.main.Main.main(SourceFile:103)

-- System Details --
Details:
	Minecraft Version: 13w36a
	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: 76493800 bytes (72 MB) / 196018176 bytes (186 MB) up to 1069416448 bytes (1019 MB)
	JVM Flags: 1 total; -Xmx1G
	AABB Pool Size: 1189 (66584 bytes; 0 MB) allocated, 18 (1008 bytes; 0 MB) used
	Suspicious classes: [com.ibm.icu.text.ArabicShapingException], [gnu.trove.TIntCollection], [gnu.trove.impl.HashFunctions, PrimeFinder], [gnu.trove.impl.hash.THash, TPrimitiveHash, TIntIntHash], [gnu.trove.iterator.TIterator, TAdvancingIterator, TIntIntIterator], [gnu.trove.map.TIntIntMap], [gnu.trove.map.hash.TIntIntHashMap], [gnu.trove.procedure.TIntIntProcedure], [gnu.trove.set.TIntSet]
	IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
	Launched Version: 13w36a
	LWJGL: 2.9.0
	OpenGL: NVIDIA GeForce 320M OpenGL Engine GL version 2.1 NVIDIA-8.12.47 310.40.00.05f01, NVIDIA Corporation
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Packs: []
	Current Language: English (UK)
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 153 (8568 bytes; 0 MB) allocated, 40 (2240 bytes; 0 MB) used