Hopper: java.lang.NullPointerException

This is an automatically generated report based from the following crash: http://hopper.minecraft.net/crashes/minecraft/MCX-197001/

Crash:

java.lang.NullPointerException
	at bkl.a(SourceFile:81)
	at bkl.a(SourceFile:15)

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

---- Minecraft Crash Report ----
// Don't be sad, have a hug! <3

Time: 20/09/13 17:13
Description: Rendering entity in world

java.lang.NullPointerException
	at bkl.a(SourceFile:81)
	at bkl.a(SourceFile:15)
	at bjq.a(SourceFile:215)
	at bjq.a(SourceFile:190)
	at bjq.a(SourceFile:167)
	at bip.a(SourceFile:347)
	at bii.a(SourceFile:974)
	at bii.b(SourceFile:809)
	at awp.aa(SourceFile:754)
	at awp.e(SourceFile:677)
	at net.minecraft.client.main.Main.main(SourceFile:104)


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

-- Head --
Stacktrace:
	at bkl.a(SourceFile:81)
	at bkl.a(SourceFile:15)

-- Entity being rendered --
Details:
	Entity Type: MinecartRideable (tz)
	Entity ID: 868921
	Entity Name: entity.MinecartRideable.name
	Entity's Exact location: -1126.63, 71.34, -2313.53
	Entity's Block location: World: (-1127,71,-2314), Chunk: (at 9,4,6 in -71,-145; contains blocks -1136,0,-2320 to -1121,255,-2305), Region: (-3,-5; contains chunks -96,-160 to -65,-129, blocks -1536,0,-2560 to -1025,255,-2049)
	Entity's Momentum: 0.00, 0.00, 0.00

-- Renderer details --
Details:
	Assigned renderer: bkl@2b050f
	Location: 1.10,24.72,39.99 - World: (1,24,39), Chunk: (at 1,1,7 in 0,2; contains blocks 0,0,32 to 15,255,47), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
	Rotation: 0.0
	Delta: 0.8230759
Stacktrace:
	at bjq.a(SourceFile:215)
	at bjq.a(SourceFile:190)
	at bjq.a(SourceFile:167)
	at bip.a(SourceFile:347)
	at bii.a(SourceFile:974)

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [bgh['BobWez98'/868888, l='MpServer', x=-1127.72, y=46.62, z=-2353.52]]
	Chunk stats: MultiplayerChunkCache: 225, 225
	Level seed: 0
	Level generator: ID 00 - default, ver 1. Features enabled: false
	Level generator options: 
	Level spawn location: World: (-112,64,252), Chunk: (at 0,4,12 in -7,15; contains blocks -112,0,240 to -97,255,255), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
	Level time: 11841484 game time, 13728421 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: survival (ID 0). Hardcore: false. Cheats: false
	Forced entities: 34 total; [bgh['BobWez98'/868888, l='MpServer', x=-1127.72, y=46.62, z=-2353.52], us['Skeleton'/869395, l='MpServer', x=-1116.50, y=39.00, z=-2402.50], ug['Creeper'/869396, l='MpServer', x=-1115.50, y=39.00, z=-2394.50], tz['entity.MinecartRideable.name'/868921, l='MpServer', x=-1126.63, y=71.34, z=-2313.53], tt['item.tile.stonebrick'/868920, l='MpServer', x=-1153.16, y=47.13, z=-2326.88], tt['item.tile.stonebrick'/868919, l='MpServer', x=-1154.88, y=47.13, z=-2326.13], uh['Enderman'/868918, l='MpServer', x=-1160.09, y=11.00, z=-2321.72], uu['Spider'/869647, l='MpServer', x=-1129.50, y=19.00, z=-2405.03], ug['Creeper'/869824, l='MpServer', x=-1127.50, y=39.00, z=-2406.50], ux['Zombie'/870334, l='MpServer', x=-1119.50, y=17.00, z=-2403.50], us['Skeleton'/870335, l='MpServer', x=-1122.50, y=17.00, z=-2403.50], ux['Zombie'/870328, l='MpServer', x=-1187.50, y=28.00, z=-2329.50], us['Skeleton'/870205, l='MpServer', x=-1109.50, y=32.00, z=-2394.50], ug['Creeper'/869309, l='MpServer', x=-1124.50, y=18.00, z=-2403.50], us['Skeleton'/870204, l='MpServer', x=-1110.50, y=32.00, z=-2394.50], us['Skeleton'/870325, l='MpServer', x=-1184.98, y=27.00, z=-2326.69], ux['Zombie'/870326, l='MpServer', x=-1187.50, y=28.00, z=-2328.50], ug['Creeper'/869310, l='MpServer', x=-1123.50, y=18.00, z=-2403.50], ux['Zombie'/870327, l='MpServer', x=-1185.50, y=28.00, z=-2329.50], us['Skeleton'/870203, l='MpServer', x=-1113.50, y=32.00, z=-2394.50], ux['Zombie'/870104, l='MpServer', x=-1163.50, y=41.00, z=-2420.50], us['Skeleton'/870148, l='MpServer', x=-1196.50, y=31.00, z=-2320.50], uu['Spider'/870149, l='MpServer', x=-1198.23, y=31.00, z=-2323.92], us['Skeleton'/869916, l='MpServer', x=-1157.91, y=16.57, z=-2315.69], us['Skeleton'/870337, l='MpServer', x=-1128.06, y=17.00, z=-2398.44], us['Skeleton'/870336, l='MpServer', x=-1124.50, y=17.00, z=-2398.50], sn['Bat'/869611, l='MpServer', x=-1116.75, y=47.54, z=-2395.72], sn['Bat'/869610, l='MpServer', x=-1120.78, y=51.98, z=-2401.59], ug['Creeper'/869823, l='MpServer', x=-1130.50, y=39.00, z=-2398.50], ug['Creeper'/870654, l='MpServer', x=-1153.50, y=14.00, z=-2318.50], ug['Creeper'/870655, l='MpServer', x=-1155.60, y=14.00, z=-2315.30], ug['Creeper'/870653, l='MpServer', x=-1156.50, y=14.00, z=-2314.50], us['Skeleton'/868934, l='MpServer', x=-1050.63, y=27.00, z=-2330.69], us['Skeleton'/868935, l='MpServer', x=-1051.56, y=27.00, z=-2328.94]]
	Retry entities: 0 total; []
	Server brand: vanilla
	Server type: Non-integrated multiplayer server
Stacktrace:
	at bgc.a(SourceFile:297)
	at awp.b(SourceFile:1874)
	at awp.e(SourceFile:686)
	at net.minecraft.client.main.Main.main(SourceFile:104)

-- System Details --
Details:
	Minecraft Version: 13w38c
	Operating System: Windows 8 (x86) version 6.2
	Java Version: 1.7.0_17, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
	Memory: 29416416 bytes (28 MB) / 108634112 bytes (103 MB) up to 518979584 bytes (494 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M
	AABB Pool Size: 30227 (1692712 bytes; 1 MB) allocated, 2 (112 bytes; 0 MB) used
	IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
	Launched Version: 13w38c
	LWJGL: 2.9.0
	OpenGL: GeForce 610M/PCIe/SSE2 GL version 4.2.0, 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: 1268 (71008 bytes; 0 MB) allocated, 33 (1848 bytes; 0 MB) used

You can see this full report at http://hopper.minecraft.net/crashes/minecraft/MCX-197001/12614645/