Hopper: java.lang.NullPointerException

This is an automatically generated report based from the following crash: http://hopper.minecraft.net/crashes/minecraft/MCX-191169/

Crash:

java.lang.NullPointerException
	at abn.a(SourceFile:110)
	at abn.h(SourceFile:234)
	at biy.a(SourceFile:22)
	at biy.a(SourceFile:17)
	at biy.a(SourceFile:12)

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

---- Minecraft Crash Report ----
// Don't do that.

Time: 9/19/13 9:38 PM
Description: Rendering Tile Entity

java.lang.NullPointerException
	at abn.a(SourceFile:110)
	at abn.h(SourceFile:234)
	at biy.a(SourceFile:22)
	at biy.a(SourceFile:17)
	at biy.a(SourceFile:12)
	at bjd.a(SourceFile:106)
	at bjd.a(SourceFile:98)
	at bfl.a(SourceFile:333)
	at bfe.a(SourceFile:845)
	at bfe.b(SourceFile:693)
	at atv.S(SourceFile:686)
	at atv.d(SourceFile:619)
	at net.minecraft.client.main.Main.main(SourceFile:101)


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

-- Head --
Stacktrace:
	at abn.a(SourceFile:110)
	at abn.h(SourceFile:234)
	at biy.a(SourceFile:22)
	at biy.a(SourceFile:17)
	at biy.a(SourceFile:12)

-- Tile Entity Details --
Details:
	Name: MobSpawner // asj
	Block type: ID #52 (tile.mobSpawner // api)
	Block data value: 1 / 0x1 / 0b0001
	Block location: World: (244,63,218), Chunk: (at 4,3,10 in 15,13; contains blocks 240,0,208 to 255,255,223), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
	Actual block type: ID #52 (tile.mobSpawner // api)
	Actual block data value: 1 / 0x1 / 0b0001
Stacktrace:
	at bjd.a(SourceFile:106)
	at bjd.a(SourceFile:98)
	at bfl.a(SourceFile:333)
	at bfe.a(SourceFile:845)

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [bdi['ryanapple146'/247, l='MpServer', x=244.07, y=65.66, z=217.51]]
	Chunk stats: MultiplayerChunkCache: 100
	Level seed: 0
	Level generator: ID 00 - default, ver 1. Features enabled: false
	Level generator options: 
	Level spawn location: World: (236,64,240), Chunk: (at 12,4,0 in 14,15; contains blocks 224,0,240 to 239,255,255), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
	Level time: 1127 game time, 1127 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: 76 total; [rz['Sheep'/143, l='MpServer', x=268.50, y=72.00, z=165.53], ss['item.tile.cloth.white'/129, l='MpServer', x=243.06, y=63.13, z=200.19], rz['Sheep'/128, l='MpServer', x=249.50, y=65.00, z=165.59], tw['Zombie'/131, l='MpServer', x=249.50, y=45.00, z=268.50], oa['Experience Orb'/130, l='MpServer', x=7748.00, y=2017.48, z=6451.00], tf['Creeper'/133, l='MpServer', x=248.50, y=45.00, z=267.50], tw['Zombie'/132, l='MpServer', x=252.50, y=45.00, z=269.50], tr['Skeleton'/135, l='MpServer', x=244.56, y=17.00, z=272.94], tr['Skeleton'/134, l='MpServer', x=252.50, y=12.00, z=281.31], tw['Zombie'/159, l='MpServer', x=283.44, y=37.00, z=156.94], rz['Sheep'/144, l='MpServer', x=269.50, y=71.00, z=162.50], rz['Sheep'/145, l='MpServer', x=268.50, y=71.00, z=164.47], tw['Zombie'/146, l='MpServer', x=257.50, y=40.00, z=277.50], sc['Squid'/147, l='MpServer', x=271.34, y=56.03, z=276.13], sc['Squid'/171, l='MpServer', x=279.63, y=54.19, z=226.16], sc['Squid'/170, l='MpServer', x=276.69, y=53.18, z=226.98], rz['Sheep'/169, l='MpServer', x=279.91, y=64.00, z=210.13], tt['Spider'/168, l='MpServer', x=285.50, y=49.00, z=208.50], sc['Squid'/175, l='MpServer', x=272.81, y=56.16, z=279.31], ro['Bat'/174, l='MpServer', x=281.75, y=21.00, z=287.66], tf['Creeper'/173, l='MpServer', x=282.50, y=21.00, z=286.50], sc['Squid'/172, l='MpServer', x=285.70, y=54.22, z=229.89], rz['Sheep'/163, l='MpServer', x=273.03, y=64.00, z=196.97], tf['Creeper'/162, l='MpServer', x=273.50, y=56.00, z=187.50], rz['Sheep'/161, l='MpServer', x=272.50, y=71.00, z=165.50], ro['Bat'/160, l='MpServer', x=269.22, y=31.38, z=167.66], rz['Sheep'/167, l='MpServer', x=276.75, y=63.00, z=215.44], tg['Enderman'/166, l='MpServer', x=285.50, y=37.00, z=215.50], ro['Bat'/165, l='MpServer', x=280.46, y=24.67, z=207.04], rz['Sheep'/164, l='MpServer', x=274.53, y=64.00, z=205.22], tf['Creeper'/186, l='MpServer', x=301.50, y=19.00, z=256.50], sc['Squid'/184, l='MpServer', x=297.68, y=52.35, z=254.30], sc['Squid'/185, l='MpServer', x=302.84, y=52.31, z=254.25], tf['Creeper'/178, l='MpServer', x=280.66, y=21.00, z=289.00], tf['Creeper'/179, l='MpServer', x=282.50, y=21.00, z=290.50], tr['Skeleton'/176, l='MpServer', x=282.56, y=20.00, z=295.95], tr['Skeleton'/177, l='MpServer', x=280.50, y=21.00, z=293.50], tw['Zombie'/206, l='MpServer', x=318.59, y=31.00, z=273.88], rz['Sheep'/201, l='MpServer', x=305.50, y=73.00, z=153.50], rz['Sheep'/200, l='MpServer', x=307.50, y=74.00, z=152.47], tr['Skeleton'/203, l='MpServer', x=317.50, y=26.00, z=198.50], tf['Creeper'/202, l='MpServer', x=313.50, y=23.00, z=181.50], tf['Creeper'/197, l='MpServer', x=306.97, y=40.00, z=145.50], rz['Sheep'/199, l='MpServer', x=307.50, y=73.00, z=153.53], rz['Sheep'/198, l='MpServer', x=305.50, y=73.00, z=153.50], tf['Creeper'/84, l='MpServer', x=202.50, y=29.00, z=205.50], tr['Skeleton'/216, l='MpServer', x=321.84, y=23.00, z=185.72], tr['Skeleton'/81, l='MpServer', x=177.50, y=11.00, z=233.50], tr['Skeleton'/218, l='MpServer', x=322.22, y=35.00, z=221.66], sc['Squid'/83, l='MpServer', x=184.53, y=50.52, z=261.03], rz['Sheep'/95, l='MpServer', x=214.50, y=70.00, z=174.50], rz['Sheep'/94, l='MpServer', x=211.50, y=70.00, z=173.50], rz['Sheep'/102, l='MpServer', x=221.19, y=64.00, z=268.81], ss['item.tile.flower'/103, l='MpServer', x=214.53, y=63.13, z=278.09], ro['Bat'/100, l='MpServer', x=217.12, y=14.00, z=245.61], rz['Sheep'/101, l='MpServer', x=222.78, y=64.00, z=267.22], tr['Skeleton'/98, l='MpServer', x=222.50, y=39.00, z=187.50], tf['Creeper'/99, l='MpServer', x=216.25, y=26.00, z=238.06], rz['Sheep'/96, l='MpServer', x=213.50, y=70.00, z=172.50], rz['Sheep'/97, l='MpServer', x=208.50, y=68.00, z=173.50], tr['Skeleton'/110, l='MpServer', x=229.50, y=25.00, z=277.50], rz['Sheep'/108, l='MpServer', x=224.50, y=63.00, z=266.50], rz['Sheep'/109, l='MpServer', x=225.50, y=63.00, z=268.50], rz['Sheep'/106, l='MpServer', x=224.31, y=63.00, z=215.75], tf['Creeper'/107, l='MpServer', x=235.50, y=46.00, z=256.50], tf['Creeper'/224, l='MpServer', x=321.41, y=16.00, z=270.00], rz['Sheep'/105, l='MpServer', x=239.58, y=63.00, z=219.62], bdi['ryanapple146'/247, l='MpServer', x=244.07, y=65.66, z=217.51], rz['Sheep'/127, l='MpServer', x=249.47, y=65.00, z=162.47], rz['Sheep'/126, l='MpServer', x=251.78, y=66.00, z=162.22], rz['Sheep'/125, l='MpServer', x=240.50, y=64.00, z=171.50], rz['Sheep'/124, l='MpServer', x=240.50, y=64.00, z=173.50], rz['Sheep'/123, l='MpServer', x=240.50, y=64.00, z=171.50], rz['Sheep'/122, l='MpServer', x=242.50, y=64.00, z=173.50], tf['Creeper'/121, l='MpServer', x=248.50, y=22.00, z=172.50], rz['Sheep'/120, l='MpServer', x=243.16, y=70.00, z=158.81]]
	Retry entities: 0 total; []
	Server brand: vanilla
	Server type: Integrated singleplayer server
Stacktrace:
	at bdd.a(SourceFile:284)
	at atv.b(SourceFile:1761)
	at atv.d(SourceFile:628)
	at net.minecraft.client.main.Main.main(SourceFile:101)

-- System Details --
Details:
	Minecraft Version: 1.6.4
	Operating System: Mac OS X (x86_64) version 10.8.4
	Java Version: 1.6.0_51, Apple Inc.
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
	Memory: 34340792 bytes (32 MB) / 146825216 bytes (140 MB) up to 1060372480 bytes (1011 MB)
	JVM Flags: 1 total; -Xmx1G
	AABB Pool Size: 12038 (674128 bytes; 0 MB) allocated, 4306 (241136 bytes; 0 MB) used
	Suspicious classes: No suspicious classes found.
	IntCache: cache: 0, tcache: 0, allocated: 3, tallocated: 63
	Launched Version: 1.6.4
	LWJGL: 2.9.0
	OpenGL: Intel HD Graphics 4000 OpenGL Engine GL version 2.1 INTEL-8.12.47, Intel Inc.
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Pack: Dokucraft TSC High 1
	Current Language: English (US)
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 7194 (402864 bytes; 0 MB) allocated, 3648 (204288 bytes; 0 MB) used

You can see this full report at http://hopper.minecraft.net/crashes/minecraft/MCX-191169/12434710/