Hopper: java.lang.NullPointerException: Getting biome

This is an automatically generated report based from the following crash: http://hopper.minecraft.net/crashes/minecraft/MCX-465180/

Crash:

java.lang.NullPointerException: Getting biome
	at aoj.a(SourceFile:934)

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

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

Time: 25/10/13 15:12
Description: Getting biome

java.lang.NullPointerException: Getting biome
	at aoj.a(SourceFile:934)
	at afn.a(SourceFile:116)
	at agd.a(SourceFile:158)
	at ajt.d(SourceFile:76)
	at ble.q(SourceFile:3857)
	at ble.b(SourceFile:131)
	at blg.a(SourceFile:163)
	at bls.a(SourceFile:1277)
	at bll.a(SourceFile:949)
	at bll.b(SourceFile:813)
	at azd.ad(SourceFile:780)
	at azd.e(SourceFile:704)
	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 aoj.a(SourceFile:934)

-- Coordinates of biome request --
Details:
	Location: World: (15,0,-1200), Chunk: (at 15,0,0 in 0,-75; contains blocks 0,0,-1200 to 15,255,-1185), Region: (0,-3; contains chunks 0,-96 to 31,-65, blocks 0,0,-1536 to 511,255,-1025)
Stacktrace:
	at afn.a(SourceFile:116)
	at agd.a(SourceFile:158)
	at ajt.d(SourceFile:76)
	at ble.q(SourceFile:3857)
	at ble.b(SourceFile:131)
	at blg.a(SourceFile:163)
	at bls.a(SourceFile:1277)
	at bll.a(SourceFile:949)

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [bje['jorloru'/127, l='MpServer', x=30,14, y=112,62, z=-1221,09]]
	Chunk stats: MultiplayerChunkCache: 15, 15
	Level seed: 0
	Level generator: ID 00 - default, ver 1. Features enabled: false
	Level generator options: 
	Level spawn location: World: (-236,64,164), Chunk: (at 4,4,4 in -15,10; contains blocks -240,0,160 to -225,255,175), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
	Level time: 1734505 game time, 127981 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: 23 total; [rf['entity.ItemFrame.name'/137, l='MpServer', x=28,06, y=114,50, z=-1219,50], rf['entity.ItemFrame.name'/136, l='MpServer', x=28,06, y=114,50, z=-1218,50], we['entity.MinecartRideable.name'/341, l='MpServer', x=45,47, y=111,50, z=-1228,50], rf['entity.ItemFrame.name'/139, l='MpServer', x=28,06, y=115,50, z=-1221,50], rf['entity.ItemFrame.name'/138, l='MpServer', x=28,06, y=115,50, z=-1221,50], vb['Oveja'/351, l='MpServer', x=53,03, y=65,00, z=-1242,94], rf['entity.ItemFrame.name'/129, l='MpServer', x=28,06, y=116,50, z=-1217,50], vb['Oveja'/350, l='MpServer', x=58,34, y=67,00, z=-1234,56], uq['Murciélago'/128, l='MpServer', x=18,92, y=15,00, z=-1217,77], rf['entity.ItemFrame.name'/131, l='MpServer', x=28,06, y=116,50, z=-1219,50], rf['entity.ItemFrame.name'/130, l='MpServer', x=28,06, y=116,50, z=-1218,50], rf['entity.ItemFrame.name'/133, l='MpServer', x=28,06, y=115,50, z=-1218,50], rf['entity.ItemFrame.name'/132, l='MpServer', x=28,06, y=115,50, z=-1217,50], rf['entity.ItemFrame.name'/135, l='MpServer', x=28,06, y=114,50, z=-1217,50], rf['entity.ItemFrame.name'/134, l='MpServer', x=28,06, y=115,50, z=-1219,50], uq['Murciélago'/352, l='MpServer', x=59,75, y=29,10, z=-1222,25], uq['Murciélago'/321, l='MpServer', x=19,75, y=18,05, z=-1208,94], wx['Esqueleto'/299, l='MpServer', x=10,50, y=13,00, z=-1217,50], uq['Murciélago'/300, l='MpServer', x=8,03, y=12,27, z=-1218,34], wx['Esqueleto'/301, l='MpServer', x=10,50, y=27,00, z=-1230,50], uq['Murciélago'/302, l='MpServer', x=15,02, y=12,00, z=-1208,69], bje['jorloru'/127, l='MpServer', x=30,14, y=112,62, z=-1221,09], uq['Murciélago'/303, l='MpServer', x=12,98, y=22,43, z=-1214,29]]
	Retry entities: 0 total; []
	Server brand: vanilla
	Server type: Integrated singleplayer server
Stacktrace:
	at biz.a(SourceFile:284)
	at azd.b(SourceFile:1951)
	at azd.e(SourceFile:713)
	at net.minecraft.client.main.Main.main(SourceFile:103)

-- System Details --
Details:
	Minecraft Version: 1.7.2
	Operating System: Windows 8 (x86) version 6.2
	Java Version: 1.7.0_45, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
	Memory: 109763768 bytes (104 MB) / 244297728 bytes (232 MB) up to 518979584 bytes (494 MB)
	JVM Flags: 1 total; -Xmx512M
	AABB Pool Size: 7955 (445480 bytes; 0 MB) allocated, 154 (8624 bytes; 0 MB) used
	IntCache: cache: 0, tcache: 0, allocated: 12, tallocated: 94
	Launched Version: 1.7.2
	LWJGL: 2.9.0
	OpenGL: GeForce GT 620/PCIe/SSE2 GL version 4.3.0, NVIDIA Corporation
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Packs: []
	Current Language: Español (España)
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 121 (6776 bytes; 0 MB) allocated, 103 (5768 bytes; 0 MB) used
	Anisotropic Filtering: Off (1)

You can see this full report at http://hopper.minecraft.net/crashes/minecraft/MCX-465180/21337119/