Hopper: java.lang.NullPointerException

java.lang.NullPointerException
	at ny.a(SourceFile:89)
	at ou.aL(SourceFile:396)
	at ou.z(SourceFile:222)
	at ov.z(SourceFile:128)
	at oc.o_(SourceFile:279)
	at ou.o_(SourceFile:1167)
	at ov.o_(SourceFile:169)
	at ud.o_(SourceFile:29)
	at oc.W(SourceFile:1164)
	at ou.W(SourceFile:1368)
	at ui.W(SourceFile:140)
	at act.a(SourceFile:1363)
	at kd.a(SourceFile:479)
	at act.g(SourceFile:1343)
	at act.a(SourceFile:1402)
	at kd.a(SourceFile:479)
	at act.g(SourceFile:1343)

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

Time: 9/6/13 9:28 PM
Description: Ticking entity

java.lang.NullPointerException
	at ny.a(SourceFile:89)
	at ou.aL(SourceFile:396)
	at ou.z(SourceFile:222)
	at ov.z(SourceFile:128)
	at oc.o_(SourceFile:279)
	at ou.o_(SourceFile:1167)
	at ov.o_(SourceFile:169)
	at ud.o_(SourceFile:29)
	at oc.W(SourceFile:1164)
	at ou.W(SourceFile:1368)
	at ui.W(SourceFile:140)
	at act.a(SourceFile:1363)
	at kd.a(SourceFile:479)
	at act.g(SourceFile:1343)
	at act.a(SourceFile:1402)
	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 ny.a(SourceFile:89)
	at ou.aL(SourceFile:396)
	at ou.z(SourceFile:222)
	at ov.z(SourceFile:128)
	at oc.o_(SourceFile:279)
	at ou.o_(SourceFile:1167)
	at ov.o_(SourceFile:169)
	at ud.o_(SourceFile:29)
	at oc.W(SourceFile:1164)
	at ou.W(SourceFile:1368)
	at ui.W(SourceFile:140)
	at act.a(SourceFile:1363)
	at kd.a(SourceFile:479)
	at act.g(SourceFile:1343)
	at act.a(SourceFile:1402)
	at kd.a(SourceFile:479)
	at act.g(SourceFile:1343)

-- Entity being ticked --
Details:
	Entity Type: Squid (sr)
	Entity ID: 1144
	Entity Name: Squid
	Entity's Exact location: 190.50, 64.50, 190.50
	Entity's Block location: World: (190,64,190), Chunk: (at 14,4,14 in 11,11; contains blocks 176,0,176 to 191,255,191), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
	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: Snapshot Testing 2.0
	All players: 1 total; [kg['Beidah'/533, l='Snapshot Testing 2.0', x=191.93, y=64.00, z=197.48]]
	Chunk stats: ServerChunkCache: 660 Drop: 0
	Level seed: 3514414972038122633
	Level generator: ID 00 - default, ver 1. Features enabled: true
	Level generator options: 
	Level spawn location: World: (256,64,232), Chunk: (at 0,4,8 in 16,14; contains blocks 256,0,224 to 271,255,239), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
	Level time: 34351 game time, 11486 day time
	Level dimension: 0
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 111894 (now: false), thunder time: 8942 (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 7 (amd64) version 6.1
	Java Version: 1.7.0_17, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 170519568 bytes (162 MB) / 320929792 bytes (306 MB) up to 954466304 bytes (910 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
	AABB Pool Size: 6347 (355432 bytes; 0 MB) allocated, 5208 (291648 bytes; 0 MB) used
	IntCache: cache: 0, tcache: 0, allocated: 12, tallocated: 94
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 3117 (174552 bytes; 0 MB) allocated, 2713 (151928 bytes; 0 MB) used
	Player Count: 1 / 8; [kg['Beidah'/533, l='Snapshot Testing 2.0', x=191.93, y=64.00, z=197.48]]
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.