Hopper: java.lang.NullPointerException

This is an automatically generated report based from the following crash: http://hopper.minecraft.net/crashes/minecraft/MCX-89417/

Crash:

java.lang.NullPointerException
	at auc.a(SourceFile:198)
	at auc.j(SourceFile:178)
	at auc.z_(SourceFile:301)
	at act.a(SourceFile:1673)
	at aez.e(SourceFile:597)
	at aez.a(SourceFile:455)
	at act.d(SourceFile:327)
	at ahf.a(SourceFile:97)
	at agc.a(SourceFile:426)
	at kc.a(SourceFile:156)
	at aez.a(SourceFile:765)
	at kc.c(SourceFile:93)
	at kc.d(SourceFile:104)
	at act.e(SourceFile:311)

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

---- Minecraft Crash Report ----
// I just don't know what went wrong :(

Time: 9/6/13 8:19 PM
Description: Exception getting block type in world

java.lang.NullPointerException
	at auc.a(SourceFile:198)
	at auc.j(SourceFile:178)
	at auc.z_(SourceFile:301)
	at act.a(SourceFile:1673)
	at aez.e(SourceFile:597)
	at aez.a(SourceFile:455)
	at act.d(SourceFile:327)
	at ahf.a(SourceFile:97)
	at agc.a(SourceFile:426)
	at kc.a(SourceFile:156)
	at aez.a(SourceFile:765)
	at kc.c(SourceFile:93)
	at kc.d(SourceFile:104)
	at act.e(SourceFile:311)
	at act.a(SourceFile:232)
	at auc.a(SourceFile:198)
	at auc.j(SourceFile:184)
	at auc.h(SourceFile:206)
	at act.h(SourceFile:1283)
	at kd.h(SourceFile:364)
	at net.minecraft.server.MinecraftServer.t(SourceFile:463)
	at net.minecraft.server.MinecraftServer.s(SourceFile:398)
	at bnn.s(SourceFile:124)
	at net.minecraft.server.MinecraftServer.run(SourceFile:332)
	at hr.run(SourceFile:575)


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

-- Head --
Stacktrace:
	at auc.a(SourceFile:198)
	at auc.j(SourceFile:178)
	at auc.z_(SourceFile:301)
	at act.a(SourceFile:1673)
	at aez.e(SourceFile:597)
	at aez.a(SourceFile:455)
	at act.d(SourceFile:327)
	at ahf.a(SourceFile:97)
	at agc.a(SourceFile:426)
	at kc.a(SourceFile:156)
	at aez.a(SourceFile:765)
	at kc.c(SourceFile:93)
	at kc.d(SourceFile:104)
	at act.e(SourceFile:311)

-- Requested block coordinates --
Details:
	Found chunk: true
	Location: World: (-68,45,159), Chunk: (at 12,2,15 in -5,9; contains blocks -80,0,144 to -65,255,159), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
Stacktrace:
	at act.a(SourceFile:232)
	at auc.a(SourceFile:198)
	at auc.j(SourceFile:184)
	at auc.h(SourceFile:206)

-- Tile entity being ticked --
Details:
	Name: Chest // auc
	Block type: ID #0
	Block data value: 0 / 0x0 / 0b0000
	Block location: World: (-68,45,160), Chunk: (at 12,2,0 in -5,10; contains blocks -80,0,160 to -65,255,175), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
	Actual block type: ID #0
	Actual block data value: 0 / 0x0 / 0b0000
Stacktrace:
	at act.h(SourceFile:1283)
	at kd.h(SourceFile:364)

-- Affected level --
Details:
	Level name: New World
	All players: 1 total; [kg['Stevestuntman'/158, l='New World', x=98.36, y=243.69, z=223.90]]
	Chunk stats: ServerChunkCache: 485 Drop: 0
	Level seed: -4353797771256949189
	Level generator: ID 03 - amplified, ver 0. Features enabled: true
	Level generator options: 
	Level spawn location: World: (168,64,256), Chunk: (at 8,4,0 in 10,16; contains blocks 160,0,256 to 175,255,271), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
	Level time: 8272 game time, 8272 day time
	Level dimension: 0
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 74856 (now: false), thunder time: 157945 (now: false)
	Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true
Stacktrace:
	at net.minecraft.server.MinecraftServer.t(SourceFile:463)
	at net.minecraft.server.MinecraftServer.s(SourceFile:398)
	at bnn.s(SourceFile:124)
	at net.minecraft.server.MinecraftServer.run(SourceFile:332)
	at hr.run(SourceFile:575)

-- System Details --
Details:
	Minecraft Version: 13w36b
	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: 91046576 bytes (86 MB) / 311025664 bytes (296 MB) up to 518979584 bytes (494 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M
	AABB Pool Size: 2619 (146664 bytes; 0 MB) allocated, 1384 (77504 bytes; 0 MB) used
	IntCache: cache: 0, tcache: 0, allocated: 12, tallocated: 94
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 5205 (291480 bytes; 0 MB) allocated, 786 (44016 bytes; 0 MB) used
	Player Count: 1 / 8; [kg['Stevestuntman'/158, l='New World', x=98.36, y=243.69, z=223.90]]
	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-89417/8484153/