Hopper: java.lang.NullPointerException

java.lang.NullPointerException
	at avg.<init>(SourceFile:23)
	at atc.a(SourceFile:723)
	at act.a(SourceFile:819)
	at act.a(SourceFile:706)
	at ou.o(SourceFile:1413)
	at rv.a(SourceFile:28)
	at rt.a(SourceFile:94)
	at ro.a(SourceFile:35)
	at aez.a(SourceFile:714)
	at act.a(SourceFile:2142)
	at rn.a(SourceFile:45)
	at qi.a(SourceFile:67)
	at ov.bk(SourceFile:406)
	at ou.d(SourceFile:1307)
	at ov.d(SourceFile:292)
	at ud.d(SourceFile:24)
	at un.d(SourceFile:155)
	at ou.o_(SourceFile:1194)
	at ov.o_(SourceFile:169)
	at ud.o_(SourceFile:29)
	at un.o_(SourceFile:211)
	at act.a(SourceFile:1365)
	at kd.a(SourceFile:479)
	at act.g(SourceFile:1343)

---- Minecraft Crash Report ----
// I let you down. Sorry :(

Time: 6/09/13 08:48 PM
Description: Ticking entity

java.lang.NullPointerException
	at avg.<init>(SourceFile:23)
	at atc.a(SourceFile:723)
	at act.a(SourceFile:819)
	at act.a(SourceFile:706)
	at ou.o(SourceFile:1413)
	at rv.a(SourceFile:28)
	at rt.a(SourceFile:94)
	at ro.a(SourceFile:35)
	at aez.a(SourceFile:714)
	at act.a(SourceFile:2142)
	at rn.a(SourceFile:45)
	at qi.a(SourceFile:67)
	at ov.bk(SourceFile:406)
	at ou.d(SourceFile:1307)
	at ov.d(SourceFile:292)
	at ud.d(SourceFile:24)
	at un.d(SourceFile:155)
	at ou.o_(SourceFile:1194)
	at ov.o_(SourceFile:169)
	at ud.o_(SourceFile:29)
	at un.o_(SourceFile:211)
	at act.a(SourceFile:1365)
	at kd.a(SourceFile:479)
	at act.g(SourceFile:1343)
	at act.h(SourceFile:1250)
	at kd.h(SourceFile:364)
	at net.minecraft.server.MinecraftServer.t(SourceFile:463)
	at net.minecraft.server.MinecraftServer.s(SourceFile:398)
	at bnn.s(SourceFile:124)
	at net.minecraft.server.MinecraftServer.run(SourceFile:332)
	at hr.run(SourceFile:575)


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

-- Head --
Stacktrace:
	at avg.<init>(SourceFile:23)
	at atc.a(SourceFile:723)
	at act.a(SourceFile:819)
	at act.a(SourceFile:706)
	at ou.o(SourceFile:1413)
	at rv.a(SourceFile:28)
	at rt.a(SourceFile:94)
	at ro.a(SourceFile:35)
	at aez.a(SourceFile:714)
	at act.a(SourceFile:2142)
	at rn.a(SourceFile:45)
	at qi.a(SourceFile:67)
	at ov.bk(SourceFile:406)
	at ou.d(SourceFile:1307)
	at ov.d(SourceFile:292)
	at ud.d(SourceFile:24)
	at un.d(SourceFile:155)
	at ou.o_(SourceFile:1194)
	at ov.o_(SourceFile:169)
	at ud.o_(SourceFile:29)
	at un.o_(SourceFile:211)
	at act.a(SourceFile:1365)
	at kd.a(SourceFile:479)
	at act.g(SourceFile:1343)

-- Entity being ticked --
Details:
	Entity Type: Zombie (un)
	Entity ID: 11780
	Entity Name: Zombi
	Entity's Exact location: -212.48, 65.00, -150.60
	Entity's Block location: World: (-213,65,-151), Chunk: (at 11,4,9 in -14,-10; contains blocks -224,0,-160 to -209,255,-145), Region: (-1,-1; contains chunks -32,-32 to -1,-1, blocks -512,0,-512 to -1,255,-1)
	Entity's Momentum: 0.00, -0.08, 0.00
Stacktrace:
	at act.h(SourceFile:1250)
	at kd.h(SourceFile:364)

-- Affected level --
Details:
	Level name: Nuevo Mundo
	All players: 1 total; [kg['ponki3'/5, l='Nuevo Mundo', x=-182.07, y=67.00, z=-181.52]]
	Chunk stats: ServerChunkCache: 930 Drop: 0
	Level seed: 5989713269254425390
	Level generator: ID 00 - default, ver 1. Features enabled: true
	Level generator options: 
	Level spawn location: World: (59,64,-67), Chunk: (at 11,4,13 in 3,-5; contains blocks 48,0,-80 to 63,255,-65), Region: (0,-1; contains chunks 0,-32 to 31,-1, blocks 0,0,-512 to 511,255,-1)
	Level time: 14990 game time, 14990 day time
	Level dimension: 0
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 77722 (now: false), thunder time: 68100 (now: false)
	Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: true
Stacktrace:
	at net.minecraft.server.MinecraftServer.t(SourceFile:463)
	at net.minecraft.server.MinecraftServer.s(SourceFile:398)
	at bnn.s(SourceFile:124)
	at net.minecraft.server.MinecraftServer.run(SourceFile:332)
	at hr.run(SourceFile:575)

-- System Details --
Details:
	Minecraft Version: 13w36b
	Operating System: Windows 8 (amd64) version 6.2
	Java Version: 1.7.0_25, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 186499480 bytes (177 MB) / 508493824 bytes (484 MB) up to 4772200448 bytes (4551 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx5G
	AABB Pool Size: 2543 (142408 bytes; 0 MB) allocated, 1162 (65072 bytes; 0 MB) used
	IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 862 (48272 bytes; 0 MB) allocated, 201 (11256 bytes; 0 MB) used
	Player Count: 1 / 8; [kg['ponki3'/5, l='Nuevo Mundo', x=-182.07, y=67.00, z=-181.52]]
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.