Hopper: java.lang.NullPointerException

java.lang.NullPointerException
	at bhm.a(SourceFile:22)
	at bhm.compare(SourceFile:7)
	at java.util.TimSort.mergeLo(Unknown Source)
	at java.util.TimSort.mergeAt(Unknown Source)
	at java.util.TimSort.mergeCollapse(Unknown Source)
	at java.util.TimSort.sort(Unknown Source)
	at java.util.TimSort.sort(Unknown Source)
	at java.util.Arrays.sort(Unknown Source)
	at bhv.a(SourceFile:442)
	at bho.a(SourceFile:839)

---- Minecraft Crash Report ----
// My bad.

Time: 9/6/13 7:29 PM
Description: Unexpected error

java.lang.NullPointerException
	at bhm.a(SourceFile:22)
	at bhm.compare(SourceFile:7)
	at java.util.TimSort.mergeLo(Unknown Source)
	at java.util.TimSort.mergeAt(Unknown Source)
	at java.util.TimSort.mergeCollapse(Unknown Source)
	at java.util.TimSort.sort(Unknown Source)
	at java.util.TimSort.sort(Unknown Source)
	at java.util.Arrays.sort(Unknown Source)
	at bhv.a(SourceFile:442)
	at bho.a(SourceFile:839)
	at bho.b(SourceFile:697)
	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 bhm.a(SourceFile:22)
	at bhm.compare(SourceFile:7)
	at java.util.TimSort.mergeLo(Unknown Source)
	at java.util.TimSort.mergeAt(Unknown Source)
	at java.util.TimSort.mergeCollapse(Unknown Source)
	at java.util.TimSort.sort(Unknown Source)
	at java.util.TimSort.sort(Unknown Source)
	at java.util.Arrays.sort(Unknown Source)
	at bhv.a(SourceFile:442)
	at bho.a(SourceFile:839)

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [bfn['largefly107'/203, l='MpServer', x=62.50, y=111.31, z=236.30]]
	Chunk stats: MultiplayerChunkCache: 343, 343
	Level seed: 0
	Level generator: ID 00 - default, ver 1. Features enabled: false
	Level generator options: 
	Level spawn location: World: (88,64,244), Chunk: (at 8,4,4 in 5,15; contains blocks 80,0,240 to 95,255,255), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
	Level time: 12247 game time, 12247 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: 131 total; [un['Zombie'/28463, l='MpServer', x=47.50, y=18.00, z=238.13], tw['Creeper'/17329, l='MpServer', x=78.97, y=24.00, z=316.50], un['Zombie'/14096, l='MpServer', x=84.50, y=25.00, z=317.50], ui['Skeleton'/29379, l='MpServer', x=93.50, y=18.00, z=178.50], un['Zombie'/14094, l='MpServer', x=82.47, y=25.00, z=315.97], sf['Chicken'/21, l='MpServer', x=-14.50, y=70.00, z=163.50], ui['Skeleton'/15524, l='MpServer', x=42.91, y=25.00, z=212.50], ui['Skeleton'/16536, l='MpServer', x=27.50, y=18.00, z=233.50], sf['Chicken'/20, l='MpServer', x=-14.50, y=70.00, z=160.50], sf['Chicken'/23, l='MpServer', x=-12.50, y=70.00, z=161.50], sf['Chicken'/22, l='MpServer', x=-14.50, y=70.00, z=164.50], un['Zombie'/28476, l='MpServer', x=24.50, y=17.00, z=224.50], sf['Chicken'/29, l='MpServer', x=-3.50, y=77.00, z=202.50], tw['Creeper'/16281, l='MpServer', x=17.38, y=14.00, z=228.50], sf['Chicken'/31, l='MpServer', x=-6.19, y=83.00, z=199.97], un['Zombie'/17630, l='MpServer', x=27.50, y=15.00, z=222.50], sf['Chicken'/30, l='MpServer', x=-4.84, y=78.00, z=203.53], un['Zombie'/17631, l='MpServer', x=31.03, y=14.00, z=218.53], sf['Chicken'/34, l='MpServer', x=2.38, y=81.00, z=196.47], sf['Chicken'/35, l='MpServer', x=-5.56, y=81.00, z=200.16], sf['Chicken'/32, l='MpServer', x=-9.50, y=85.00, z=199.50], sf['Chicken'/33, l='MpServer', x=-11.50, y=86.00, z=198.50], un['Zombie'/27220, l='MpServer', x=46.50, y=14.00, z=217.50], sf['Chicken'/38, l='MpServer', x=7.45, y=75.00, z=273.53], sf['Chicken'/39, l='MpServer', x=-20.53, y=62.36, z=277.47], tw['Creeper'/29419, l='MpServer', x=24.50, y=14.00, z=263.50], sf['Chicken'/37, l='MpServer', x=-5.47, y=74.00, z=268.84], tw['Creeper'/27228, l='MpServer', x=60.50, y=28.00, z=317.50], tj['item.item.egg'/46, l='MpServer', x=6.50, y=74.13, z=199.59], sf['Chicken'/45, l='MpServer', x=4.41, y=77.00, z=193.34], sf['Chicken'/51, l='MpServer', x=3.27, y=76.92, z=263.25], sh['Horse'/11908, l='MpServer', x=68.69, y=64.00, z=272.88], sf['Chicken'/54, l='MpServer', x=25.56, y=70.00, z=207.66], ui['Skeleton'/29840, l='MpServer', x=36.50, y=12.00, z=243.50], sf['Chicken'/56, l='MpServer', x=30.53, y=69.00, z=208.47], sf['Chicken'/63, l='MpServer', x=34.56, y=73.00, z=247.56], sf['Chicken'/62, l='MpServer', x=26.59, y=72.00, z=250.41], sf['Chicken'/61, l='MpServer', x=30.50, y=72.00, z=240.50], sd['Bat'/15607, l='MpServer', x=52.44, y=18.98, z=226.25], un['Zombie'/25792, l='MpServer', x=50.50, y=19.00, z=207.50], sh['King Horse of Butter 1'/11179, l='MpServer', x=6.00, y=66.00, z=296.50], sf['Chicken'/64, l='MpServer', x=30.54, y=72.62, z=254.58], sf['Chicken'/65, l='MpServer', x=23.59, y=72.00, z=246.47], sf['Chicken'/66, l='MpServer', x=28.82, y=72.00, z=245.50], sg['Cow'/76, l='MpServer', x=43.25, y=66.00, z=201.19], sg['Cow'/75, l='MpServer', x=44.50, y=68.00, z=207.50], sf['Chicken'/85, l='MpServer', x=44.50, y=72.00, z=213.50], sf['Chicken'/84, l='MpServer', x=47.50, y=72.00, z=213.50], un['Zombie'/16602, l='MpServer', x=63.50, y=22.00, z=300.50], sf['Chicken'/87, l='MpServer', x=34.50, y=73.00, z=243.50], sg['Cow'/86, l='MpServer', x=37.38, y=71.00, z=215.41], sf['Chicken'/81, l='MpServer', x=34.50, y=71.00, z=212.50], tw['Creeper'/28856, l='MpServer', x=76.50, y=34.00, z=308.50], sf['Chicken'/80, l='MpServer', x=45.56, y=71.00, z=201.56], sh['Horse'/12004, l='MpServer', x=74.56, y=64.00, z=272.53], sf['Chicken'/83, l='MpServer', x=44.50, y=71.00, z=211.50], sf['Chicken'/82, l='MpServer', x=44.50, y=72.00, z=213.50], tw['Creeper'/15868, l='MpServer', x=16.50, y=26.00, z=195.50], tw['Creeper'/15867, l='MpServer', x=13.50, y=26.00, z=198.50], sf['Chicken'/88, l='MpServer', x=41.41, y=77.00, z=258.41], tj['item.item.leash'/14977, l='MpServer', x=77.72, y=70.13, z=263.09], ui['Skeleton'/28492, l='MpServer', x=60.59, y=21.00, z=291.84], un['Zombie'/28493, l='MpServer', x=62.50, y=21.00, z=295.50], sd['Bat'/16890, l='MpServer', x=52.34, y=20.10, z=228.75], un['Zombie'/28495, l='MpServer', x=60.50, y=21.00, z=296.50], sf['Chicken'/98, l='MpServer', x=57.56, y=77.00, z=235.63], sg['Cow'/96, l='MpServer', x=47.69, y=65.00, z=190.25], sh['Horse'/10904, l='MpServer', x=70.81, y=64.00, z=277.31], ui['Skeleton'/28491, l='MpServer', x=62.50, y=21.00, z=292.50], tw['Creeper'/29361, l='MpServer', x=32.50, y=15.00, z=243.50], sf['Chicken'/127, l='MpServer', x=86.47, y=72.00, z=224.53], sh['Horse'/11771, l='MpServer', x=74.22, y=64.00, z=274.41], tw['Creeper'/29737, l='MpServer', x=77.50, y=15.00, z=176.50], sr['Squid'/140, l='MpServer', x=79.50, y=48.34, z=291.50], tw['Creeper'/29738, l='MpServer', x=79.50, y=15.00, z=167.50], sh['Horse'/129, l='MpServer', x=68.56, y=64.00, z=271.50], sf['Chicken'/128, l='MpServer', x=73.63, y=79.00, z=251.59], sh['Horse'/131, l='MpServer', x=58.00, y=70.00, z=276.00], sh['Horse'/130, l='MpServer', x=70.88, y=63.00, z=280.22], sh['Horse'/10577, l='MpServer', x=73.47, y=63.00, z=279.34], sd['Bat'/16643, l='MpServer', x=69.56, y=29.10, z=299.56], sf['Chicken'/159, l='MpServer', x=102.38, y=72.00, z=234.56], sd['Bat'/24543, l='MpServer', x=5.59, y=10.85, z=224.14], bfn['largefly107'/203, l='MpServer', x=62.50, y=111.31, z=236.30], ui['Skeleton'/29008, l='MpServer', x=25.43, y=25.00, z=275.53], ui['Skeleton'/29009, l='MpServer', x=26.43, y=25.00, z=275.24], ui['Skeleton'/29556, l='MpServer', x=27.31, y=25.00, z=281.69], uk['Spider'/29557, l='MpServer', x=28.88, y=25.00, z=280.13], ui['Skeleton'/29555, l='MpServer', x=25.50, y=25.00, z=276.50], sd['Bat'/24552, l='MpServer', x=64.50, y=28.00, z=314.91], sf['Chicken'/186, l='MpServer', x=116.50, y=70.00, z=215.50], sf['Chicken'/184, l='MpServer', x=120.47, y=70.00, z=216.44], sf['Chicken'/185, l='MpServer', x=118.31, y=70.00, z=214.72], ui['Skeleton'/29551, l='MpServer', x=75.50, y=16.00, z=179.50], ui['Skeleton'/29550, l='MpServer', x=77.50, y=16.00, z=179.50], tx['Enderman'/29549, l='MpServer', x=78.50, y=16.00, z=179.50], un['Zombie'/29003, l='MpServer', x=-5.50, y=30.00, z=198.50], tx['Enderman'/29548, l='MpServer', x=74.50, y=16.00, z=179.50], sh['Horse'/11101, l='MpServer', x=72.72, y=64.00, z=270.41], sf['Chicken'/183, l='MpServer', x=118.50, y=70.00, z=215.50], sd['Bat'/14408, l='MpServer', x=27.84, y=17.58, z=225.97], ot['entity.LeashKnot.name'/27858, l='MpServer', x=7.50, y=66.50, z=295.50], uk['Spider'/28646, l='MpServer', x=74.47, y=43.00, z=177.04], un['Zombie'/17963, l='MpServer', x=66.50, y=21.00, z=295.50], un['Zombie'/17964, l='MpServer', x=66.50, y=21.00, z=296.50], tw['Creeper'/29188, l='MpServer', x=68.50, y=33.00, z=159.50], tw['Creeper'/17965, l='MpServer', x=71.31, y=23.00, z=299.53], ui['Skeleton'/29795, l='MpServer', x=27.50, y=28.00, z=285.50], ui['Skeleton'/16462, l='MpServer', x=85.50, y=21.00, z=312.50], ui['Skeleton'/16463, l='MpServer', x=85.50, y=21.00, z=311.50], tw['Creeper'/16465, l='MpServer', x=88.50, y=22.00, z=308.50], sd['Bat'/24466, l='MpServer', x=23.38, y=18.76, z=232.88], sd['Bat'/24465, l='MpServer', x=25.75, y=16.35, z=221.44], tx['Enderman'/29442, l='MpServer', x=49.50, y=16.00, z=215.50], sd['Bat'/29808, l='MpServer', x=86.50, y=38.00, z=157.53], sd['Bat'/29809, l='MpServer', x=86.50, y=38.19, z=159.50], ui['Skeleton'/28396, l='MpServer', x=54.16, y=22.00, z=213.47], tw['Creeper'/28948, l='MpServer', x=131.50, y=16.00, z=235.50], tw['Creeper'/28950, l='MpServer', x=132.48, y=16.00, z=233.50], tw['Creeper'/28951, l='MpServer', x=137.87, y=15.00, z=240.96], uk['Spider'/28370, l='MpServer', x=48.72, y=21.00, z=291.53], tw['Creeper'/28947, l='MpServer', x=131.50, y=16.00, z=236.50], un['Zombie'/29493, l='MpServer', x=24.50, y=17.00, z=228.50], ui['Skeleton'/28369, l='MpServer', x=48.94, y=20.00, z=294.47], ui['Skeleton'/24895, l='MpServer', x=26.50, y=16.00, z=226.50], sh['Horse'/11622, l='MpServer', x=74.41, y=64.00, z=269.41], ui['Skeleton'/24894, l='MpServer', x=26.50, y=16.00, z=227.50], sd['Bat'/29233, l='MpServer', x=66.74, y=39.03, z=317.76], sd['Bat'/29236, l='MpServer', x=88.93, y=41.00, z=304.75], ui['Skeleton'/28367, l='MpServer', x=-3.09, y=11.00, z=247.34], tj['item.item.monsterPlacer'/13218, l='MpServer', x=80.38, y=64.13, z=272.63]]
	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:656)
	at net.minecraft.client.main.Main.main(SourceFile:103)

-- System Details --
Details:
	Minecraft Version: 13w36b
	Operating System: Windows XP (x86) version 5.1
	Java Version: 1.7.0_25, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
	Memory: 102343584 bytes (97 MB) / 256524288 bytes (244 MB) up to 518979584 bytes (494 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M
	AABB Pool Size: 62935 (3524360 bytes; 3 MB) allocated, 1627 (91112 bytes; 0 MB) used
	IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
	Launched Version: 13w36b
	LWJGL: 2.9.0
	OpenGL: ATI Radeon HD 3800 Series GL version 3.3.11672 Compatibility Profile Context, 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: 30090 (1685040 bytes; 1 MB) allocated, 309 (17304 bytes; 0 MB) used