Hopper: java.lang.NullPointerException arv.a(SourceFile:197)

This is an automatically generated report based from the following crash: http://hopper.minecraft.net/crashes/minecraft/MCX-12137/

Crash:

java.lang.NullPointerException
	at arv.a(SourceFile:197)
	at arv.j(SourceFile:177)
	at arv.w_(SourceFile:300)
	at abv.a(SourceFile:1658)
	at adq.e(SourceFile:540)
	at adq.a(SourceFile:397)
	at abv.f(SourceFile:306)
	at aiq.a(SourceFile:590)
	at agw.a(SourceFile:1307)
	at ais.a(SourceFile:29)
	at aim.a(SourceFile:72)
	at aeo.a(SourceFile:319)
	at jq.a(SourceFile:168)
	at adq.a(SourceFile:729)
	at jq.c(SourceFile:105)
	at jq.d(SourceFile:116)
	at abv.e(SourceFile:289)

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

---- Minecraft Crash Report ----
// Surprise! Haha. Well, this is awkward.

Time: 2013-08-17 02:42
Description: Exception getting block type in world

java.lang.NullPointerException
	at arv.a(SourceFile:197)
	at arv.j(SourceFile:177)
	at arv.w_(SourceFile:300)
	at abv.a(SourceFile:1658)
	at adq.e(SourceFile:540)
	at adq.a(SourceFile:397)
	at abv.f(SourceFile:306)
	at aiq.a(SourceFile:590)
	at agw.a(SourceFile:1307)
	at ais.a(SourceFile:29)
	at aim.a(SourceFile:72)
	at aeo.a(SourceFile:319)
	at jq.a(SourceFile:168)
	at adq.a(SourceFile:729)
	at jq.c(SourceFile:105)
	at jq.d(SourceFile:116)
	at abv.e(SourceFile:289)
	at abv.a(SourceFile:213)
	at arv.a(SourceFile:197)
	at arv.j(SourceFile:177)
	at arv.h(SourceFile:205)
	at abv.h(SourceFile:1267)
	at jr.h(SourceFile:364)
	at net.minecraft.server.MinecraftServer.t(SourceFile:470)
	at net.minecraft.server.MinecraftServer.s(SourceFile:405)
	at bkw.s(SourceFile:124)
	at net.minecraft.server.MinecraftServer.run(SourceFile:339)
	at hh.run(SourceFile:582)


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

-- Head --
Stacktrace:
	at arv.a(SourceFile:197)
	at arv.j(SourceFile:177)
	at arv.w_(SourceFile:300)
	at abv.a(SourceFile:1658)
	at adq.e(SourceFile:540)
	at adq.a(SourceFile:397)
	at abv.f(SourceFile:306)
	at aiq.a(SourceFile:590)
	at agw.a(SourceFile:1307)
	at ais.a(SourceFile:29)
	at aim.a(SourceFile:72)
	at aeo.a(SourceFile:319)
	at jq.a(SourceFile:168)
	at adq.a(SourceFile:729)
	at jq.c(SourceFile:105)
	at jq.d(SourceFile:116)
	at abv.e(SourceFile:289)

-- Requested block coordinates --
Details:
	Found chunk: true
	Location: World: (-81,53,-120), Chunk: (at 15,3,8 in -6,-8; contains blocks -96,0,-128 to -81,255,-113), Region: (-1,-1; contains chunks -32,-32 to -1,-1, blocks -512,0,-512 to -1,255,-1)
Stacktrace:
	at abv.a(SourceFile:213)
	at arv.a(SourceFile:197)
	at arv.j(SourceFile:177)
	at arv.h(SourceFile:205)

-- Tile entity being ticked --
Details:
	Name: Chest // arv
	Block type: ID #54 (tile.chest // anh)
	Block data value: 4 / 0x4 / 0b0100
	Block location: World: (-80,53,-120), Chunk: (at 0,3,8 in -5,-8; contains blocks -80,0,-128 to -65,255,-113), Region: (-1,-1; contains chunks -32,-32 to -1,-1, blocks -512,0,-512 to -1,255,-1)
	Actual block type: ID #54 (tile.chest // anh)
	Actual block data value: 4 / 0x4 / 0b0100
Stacktrace:
	at abv.h(SourceFile:1267)
	at jr.h(SourceFile:364)

-- Affected level --
Details:
	Level name: New World
	All players: 2 total; [ju['Bermhed'/113657, l='New World', x=102,18, y=71,00, z=17,11], ju['Sheepwall'/1117220, l='New World', x=93,74, y=69,00, z=14,38]]
	Chunk stats: ServerChunkCache: 565 Drop: 0
	Level seed: 6912315400225177288
	Level generator: ID 00 - default, ver 1. Features enabled: false
	Level generator options: 
	Level spawn location: 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)
	Level time: 0 game time, 0 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: ~~ERROR~~ NullPointerException: null
Stacktrace:
	at net.minecraft.server.MinecraftServer.t(SourceFile:470)
	at net.minecraft.server.MinecraftServer.s(SourceFile:405)
	at bkw.s(SourceFile:124)
	at net.minecraft.server.MinecraftServer.run(SourceFile:339)
	at hh.run(SourceFile:582)

-- System Details --
Details:
	Minecraft Version: 1.6.2
	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: 616328280 bytes (587 MB) / 1007943680 bytes (961 MB) up to 1007943680 bytes (961 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
	AABB Pool Size: 8179 (458024 bytes; 0 MB) allocated, 7040 (394240 bytes; 0 MB) used
	Suspicious classes: No suspicious classes found.
	IntCache: cache: 0, tcache: 0, allocated: 1, tallocated: 63
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 4398 (246288 bytes; 0 MB) allocated, 3493 (195608 bytes; 0 MB) used
	Player Count: 4 / 8; [ju['--session'/115917, l='New World', x=154,30, y=71,00, z=238,70], ju['sebbe9999'/125475, l='New World', x=-321,89, y=94,00, z=347,52], ju['Bermhed'/113657, l='New World', x=102,18, y=71,00, z=17,11], ju['Sheepwall'/1117220, l='New World', x=93,74, y=69,00, z=14,38]]
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.

You can see this full report at http://hopper.minecraft.net/crashes/minecraft/MCX-12137/3467655/