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 sh.o_(SourceFile:997)
	at act.a(SourceFile:1365)
	at act.g(SourceFile:1343)

---- Minecraft Crash Report ----
// Who set us up the TNT?

Time: 9/6/13 11:25 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 sh.o_(SourceFile:997)
	at act.a(SourceFile:1365)
	at act.g(SourceFile:1343)
	at act.h(SourceFile:1250)
	at awb.m(SourceFile:1426)
	at awb.V(SourceFile:686)
	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 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 sh.o_(SourceFile:997)
	at act.a(SourceFile:1365)
	at act.g(SourceFile:1343)

-- Entity being ticked --
Details:
	Entity Type: EntityHorse (sh)
	Entity ID: 1051
	Entity Name: Horse
	Entity's Exact location: -224.50, 69.00, 110.50
	Entity's Block location: World: (-225,69,110), Chunk: (at 15,4,14 in -15,6; contains blocks -240,0,96 to -225,255,111), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
	Entity's Momentum: 0.00, 0.00, 0.00
Stacktrace:
	at act.h(SourceFile:1250)

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [bfn['ripjaws7'/4, l='MpServer', x=-224.07, y=70.75, z=110.55]]
	Chunk stats: MultiplayerChunkCache: 272, 272
	Level seed: 0
	Level generator: ID 01 - flat, ver 0. Features enabled: false
	Level generator options: 
	Level spawn location: World: (-180,4,84), Chunk: (at 12,0,4 in -12,5; contains blocks -192,0,80 to -177,255,95), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
	Level time: 64654 game time, 6000 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: 15 total; [sh['Horse'/508, l='MpServer', x=-219.13, y=64.00, z=108.25], sh['Horse'/957, l='MpServer', x=-226.03, y=64.00, z=117.13], bfn['ripjaws7'/4, l='MpServer', x=-224.07, y=70.75, z=110.55], sh['Horse'/613, l='MpServer', x=-251.00, y=64.00, z=117.91], sh['Horse'/1009, l='MpServer', x=-228.00, y=64.00, z=110.22], sh['Horse'/915, l='MpServer', x=-230.41, y=64.00, z=115.81], sh['Horse'/376, l='MpServer', x=-161.94, y=64.00, z=133.28], sh['Horse'/1051, l='MpServer', x=-224.50, y=69.00, z=110.50], sh['Horse'/699, l='MpServer', x=-260.22, y=64.00, z=99.06], sh['Horse'/396, l='MpServer', x=-261.97, y=64.00, z=89.78], sh['Horse'/387, l='MpServer', x=-175.44, y=64.00, z=46.28], sh['Horse'/873, l='MpServer', x=-247.19, y=64.00, z=132.66], sh['Horse'/781, l='MpServer', x=-221.50, y=64.00, z=82.19], sh['Horse'/657, l='MpServer', x=-218.06, y=64.00, z=121.19], sh['Horse'/570, l='MpServer', x=-217.22, y=64.00, z=102.50]]
	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 (x86) version 6.1
	Java Version: 1.7.0_25, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
	Memory: 135083048 bytes (128 MB) / 349495296 bytes (333 MB) up to 518979584 bytes (494 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M
	AABB Pool Size: 474 (26544 bytes; 0 MB) allocated, 271 (15176 bytes; 0 MB) used
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	Launched Version: 13w36b
	LWJGL: 2.9.0
	OpenGL: ATI Radeon HD 4550    GL version 3.3.10750 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: 81 (4536 bytes; 0 MB) allocated, 47 (2632 bytes; 0 MB) used