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

This is an automatically generated report based from the following crash: http://hopper.minecraft.net/crashes/minecraft/MCX-2753/

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 afo.a(SourceFile:96)
	at aes.a(SourceFile:451)
	at jq.a(SourceFile:168)
	at adq.a(SourceFile:723)
	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 ----
// Oh - I know what I did wrong!

Time: 02/08/13 13:50
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 afo.a(SourceFile:96)
	at aes.a(SourceFile:451)
	at jq.a(SourceFile:168)
	at adq.a(SourceFile:723)
	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:183)
	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 afo.a(SourceFile:96)
	at aes.a(SourceFile:451)
	at jq.a(SourceFile:168)
	at adq.a(SourceFile:723)
	at jq.c(SourceFile:105)
	at jq.d(SourceFile:116)
	at abv.e(SourceFile:289)

-- Requested block coordinates --
Details:
	Found chunk: true
	Location: World: (173,14,143), Chunk: (at 13,0,15 in 10,8; contains blocks 160,0,128 to 175,255,143), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Stacktrace:
	at abv.a(SourceFile:213)
	at arv.a(SourceFile:197)
	at arv.j(SourceFile:183)
	at arv.h(SourceFile:205)

-- Tile entity being ticked --
Details:
	Name: Chest // arv
	Block type: ID #54 (tile.chest // anh)
	Block data value: 2 / 0x2 / 0b0010
	Block location: World: (173,14,144), Chunk: (at 13,0,0 in 10,9; contains blocks 160,0,144 to 175,255,159), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
	Actual block type: ID #54 (tile.chest // anh)
	Actual block data value: 2 / 0x2 / 0b0010
Stacktrace:
	at abv.h(SourceFile:1267)
	at jr.h(SourceFile:364)

-- Affected level --
Details:
	Level name: ComputerTest
	All players: 1 total; [ju['Xenmaster1234'/209, l='ComputerTest', x=-21.05, y=66.43, z=251.44]]
	Chunk stats: ServerChunkCache: 590 Drop: 0
	Level seed: -9184661396399656632
	Level generator: ID 00 - default, ver 1. Features enabled: true
	Level generator options: 
	Level spawn location: World: (0,64,252), Chunk: (at 0,4,12 in 0,15; contains blocks 0,0,240 to 15,255,255), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
	Level time: 290 game time, 290 day time
	Level dimension: 0
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 90574 (now: false), thunder time: 66618 (now: false)
	Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true
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 XP (x86) version 5.1
	Java Version: 1.7.0_25, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
	Memory: 63959680 bytes (60 MB) / 262434816 bytes (250 MB) up to 518979584 bytes (494 MB)
	JVM Flags: 1 total; -Xmx512M
	AABB Pool Size: 4842 (271152 bytes; 0 MB) allocated, 2469 (138264 bytes; 0 MB) used
	Suspicious classes: No suspicious classes found.
	IntCache: cache: 4, tcache: 62, allocated: 0, tallocated: 0
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 2521 (141176 bytes; 0 MB) allocated, 916 (51296 bytes; 0 MB) used
	Player Count: 1 / 8; [ju['Xenmaster1234'/209, l='ComputerTest', x=-21.05, y=66.43, z=251.44]]
	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-2753/22834/