Hopper: java.lang.NullPointerException

This is an automatically generated report based from the following crash: http://hopper.minecraft.net/crashes/minecraft/MCX-79519/

Crash:

java.lang.NullPointerException
	at ack.a(SourceFile:110)
	at ack.h(SourceFile:234)
	at blg.a(SourceFile:22)
	at bjl.a(SourceFile:14)
	at bjl.a(SourceFile:8)
	at bjk.a(SourceFile:89)
	at bjk.a(SourceFile:15)

The following is the first clean report made public about this crash:

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

Time: 9/5/13 5:31 PM
Description: Rendering entity in world

java.lang.NullPointerException
	at ack.a(SourceFile:110)
	at ack.h(SourceFile:234)
	at blg.a(SourceFile:22)
	at bjl.a(SourceFile:14)
	at bjl.a(SourceFile:8)
	at bjk.a(SourceFile:89)
	at bjk.a(SourceFile:15)
	at bip.a(SourceFile:206)
	at blg.a(SourceFile:32)
	at blg.a(SourceFile:17)
	at blg.a(SourceFile:12)
	at bll.a(SourceFile:106)
	at bll.a(SourceFile:98)
	at bho.a(SourceFile:334)
	at bhh.a(SourceFile:848)
	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 ack.a(SourceFile:110)
	at ack.h(SourceFile:234)
	at blg.a(SourceFile:22)
	at bjl.a(SourceFile:14)
	at bjl.a(SourceFile:8)
	at bjk.a(SourceFile:89)
	at bjk.a(SourceFile:15)

-- Entity being rendered --
Details:
	Entity Type: MinecartSpawner (tq)
	Entity ID: 196926
	Entity Name: entity.MinecartSpawner.name
	Entity's Exact location: 10.83, -62.69, -0.40
	Entity's Block location: World: (10,-63,-1), Chunk: (at 10,-4,15 in 0,-1; contains blocks 0,0,-16 to 15,255,-1), Region: (0,-1; contains chunks 0,-32 to 31,-1, blocks 0,0,-512 to 511,255,-1)
	Entity's Momentum: 0.00, 0.00, 0.00

-- Renderer details --
Details:
	Assigned renderer: bjl@46699bd1
	Location: 0.00,0.00,0.00 - World: (0,0,0), Chunk: (at 0,0,0 in 0,0; contains blocks 0,0,0 to 15,255,15), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
	Rotation: 0.0
	Delta: 0.979367
Stacktrace:
	at bip.a(SourceFile:206)
	at blg.a(SourceFile:32)
	at blg.a(SourceFile:17)
	at blg.a(SourceFile:12)

-- Tile Entity Details --
Details:
	Name: MobSpawner // aul
	Block type: ID #52 (tile.mobSpawner // ari)
	Block data value: 0 / 0x0 / 0b0000
	Block location: World: (-269,44,0), Chunk: (at 3,2,0 in -17,0; contains blocks -272,0,0 to -257,255,15), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
	Actual block type: ID #52 (tile.mobSpawner // ari)
	Actual block data value: 0 / 0x0 / 0b0000
Stacktrace:
	at bll.a(SourceFile:106)
	at bll.a(SourceFile:98)
	at bho.a(SourceFile:334)
	at bhh.a(SourceFile:848)

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [bfg['CityReselection'/1176, l='MpServer', x=-279.83, y=107.02, z=0.39]]
	Chunk stats: MultiplayerChunkCache: 319, 319
	Level seed: 0
	Level generator: ID 01 - flat, ver 0. Features enabled: false
	Level generator options: 
	Level spawn location: World: (-123,70,133), Chunk: (at 5,4,5 in -8,8; contains blocks -128,0,128 to -113,255,143), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
	Level time: 9777611 game time, 205 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: 55 total; [os['entity.ItemFrame.name'/0, l='MpServer', x=-315.06, y=45.50, z=-9.50], os['entity.ItemFrame.name'/1, l='MpServer', x=-315.06, y=45.50, z=-1.50], os['entity.ItemFrame.name'/2, l='MpServer', x=-315.06, y=45.50, z=8.50], os['entity.ItemFrame.name'/3, l='MpServer', x=-310.06, y=54.50, z=3.50], os['entity.ItemFrame.name'/4, l='MpServer', x=-310.06, y=54.50, z=15.50], os['entity.ItemFrame.name'/5, l='MpServer', x=-315.06, y=45.50, z=16.50], pa['Painting'/7, l='MpServer', x=-284.94, y=95.00, z=-4.00], os['entity.ItemFrame.name'/8, l='MpServer', x=-280.06, y=94.50, z=-3.50], os['entity.ItemFrame.name'/129, l='MpServer', x=-330.50, y=44.50, z=-2.94], os['entity.ItemFrame.name'/9, l='MpServer', x=-280.06, y=95.50, z=-3.50], os['entity.ItemFrame.name'/131, l='MpServer', x=-331.50, y=45.50, z=-2.94], os['entity.ItemFrame.name'/10, l='MpServer', x=-280.06, y=95.50, z=-4.50], os['entity.ItemFrame.name'/130, l='MpServer', x=-331.50, y=44.50, z=-2.94], os['entity.ItemFrame.name'/11, l='MpServer', x=-280.06, y=94.50, z=-4.50], os['entity.ItemFrame.name'/133, l='MpServer', x=-323.94, y=45.50, z=-0.50], pa['Painting'/12, l='MpServer', x=-283.50, y=95.50, z=-6.94], os['entity.ItemFrame.name'/132, l='MpServer', x=-330.50, y=45.50, z=-2.94], pa['Painting'/13, l='MpServer', x=-281.50, y=95.50, z=-6.94], pa['Painting'/14, l='MpServer', x=-284.94, y=95.00, z=5.00], os['entity.ItemFrame.name'/15, l='MpServer', x=-280.06, y=95.50, z=4.50], os['entity.ItemFrame.name'/17, l='MpServer', x=-280.06, y=95.50, z=5.50], os['entity.ItemFrame.name'/16, l='MpServer', x=-280.06, y=94.50, z=4.50], pa['Painting'/19, l='MpServer', x=-283.50, y=95.50, z=7.94], os['entity.ItemFrame.name'/18, l='MpServer', x=-280.06, y=94.50, z=5.50], vc['Fireball'/21, l='MpServer', x=-278.97, y=94.00, z=20.41], pa['Painting'/20, l='MpServer', x=-281.50, y=95.50, z=7.94], vc['Fireball'/23, l='MpServer', x=-271.50, y=87.50, z=-18.50], vc['Fireball'/22, l='MpServer', x=-271.50, y=87.50, z=-19.50], vc['Fireball'/25, l='MpServer', x=-271.50, y=87.50, z=-19.50], vc['Fireball'/24, l='MpServer', x=-271.50, y=87.50, z=-20.50], ui['§2GateKeeper'/38, l='MpServer', x=-212.50, y=64.00, z=0.50], ui['§2GateKeeper'/39, l='MpServer', x=-212.50, y=64.00, z=38.50], vc['Fireball'/36, l='MpServer', x=-271.50, y=87.50, z=18.50], ui['§2GateKeeper'/37, l='MpServer', x=-212.50, y=64.00, z=-37.50], pa['Painting'/20, l='MpServer', x=-281.50, y=95.50, z=7.94], pa['Painting'/19, l='MpServer', x=-283.50, y=95.50, z=7.94], pa['Painting'/13, l='MpServer', x=-281.50, y=95.50, z=-6.94], pa['Painting'/12, l='MpServer', x=-283.50, y=95.50, z=-6.94], tq['entity.MinecartSpawner.name'/4584, l='MpServer', x=-269.50, y=43.50, z=4.50], pa['Painting'/7, l='MpServer', x=-284.94, y=95.00, z=-4.00], tq['entity.MinecartSpawner.name'/4585, l='MpServer', x=-269.50, y=43.50, z=13.50], tq['entity.MinecartSpawner.name'/4586, l='MpServer', x=-269.50, y=43.50, z=19.50], tq['entity.MinecartSpawner.name'/4580, l='MpServer', x=-269.50, y=44.34, z=0.50], pa['Painting'/14, l='MpServer', x=-284.94, y=95.00, z=5.00], os['entity.ItemFrame.name'/1187, l='MpServer', x=-330.50, y=44.50, z=15.94], os['entity.ItemFrame.name'/1186, l='MpServer', x=-331.50, y=44.50, z=15.94], os['entity.ItemFrame.name'/1191, l='MpServer', x=-329.50, y=45.50, z=15.94], os['entity.ItemFrame.name'/1190, l='MpServer', x=-328.50, y=45.50, z=15.94], tq['entity.MinecartSpawner.name'/4569, l='MpServer', x=-269.50, y=43.38, z=25.50], os['entity.ItemFrame.name'/1189, l='MpServer', x=-328.50, y=44.50, z=15.94], tq['entity.MinecartSpawner.name'/4568, l='MpServer', x=-269.50, y=43.38, z=7.50], os['entity.ItemFrame.name'/1188, l='MpServer', x=-329.50, y=44.50, z=15.94], bfg['CityReselection'/1176, l='MpServer', x=-279.83, y=107.02, z=0.39], os['entity.ItemFrame.name'/1193, l='MpServer', x=-331.50, y=45.50, z=15.94], os['entity.ItemFrame.name'/1192, l='MpServer', x=-330.50, y=45.50, z=15.94]]
	Retry entities: 0 total; []
	Server brand: vanilla
	Server type: Non-integrated multiplayer server
Stacktrace:
	at bfb.a(SourceFile:285)
	at avx.b(SourceFile:1813)
	at avx.e(SourceFile:651)
	at net.minecraft.client.main.Main.main(SourceFile:103)

-- System Details --
Details:
	Minecraft Version: 13w36a
	Operating System: Windows 7 (amd64) version 6.1
	Java Version: 1.7.0_21, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 200035616 bytes (190 MB) / 268304384 bytes (255 MB) up to 954466304 bytes (910 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
	AABB Pool Size: 2689 (150584 bytes; 0 MB) allocated, 2 (112 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: 0, tallocated: 0
	Launched Version: 13w36a
	LWJGL: 2.9.0
	OpenGL: GeForce GT 335M/PCI/SSE2 GL version 3.3.0, NVIDIA Corporation
	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: 251 (14056 bytes; 0 MB) allocated, 28 (1568 bytes; 0 MB) used

You can see this full report at http://hopper.minecraft.net/crashes/minecraft/MCX-79519/8229733/