Hopper: java.lang.NullPointerException

This is an automatically generated report based from the following crash: http://hopper.minecraft.net/crashes/minecraft/MCX-190585/

Crash:

java.lang.NullPointerException
	at ary.a(SourceFile:197)
	at ary.j(SourceFile:177)
	at ary.w_(SourceFile:300)
	at abw.a(SourceFile:1658)
	at adr.e(SourceFile:540)
	at adr.a(SourceFile:397)
	at abw.f(SourceFile:306)
	at afp.a(SourceFile:96)
	at aet.a(SourceFile:451)
	at jr.a(SourceFile:168)
	at adr.a(SourceFile:723)
	at jr.c(SourceFile:105)
	at jr.d(SourceFile:116)
	at abw.e(SourceFile:289)

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

---- Minecraft Crash Report ----
// My bad.

Time: 9/19/13 6:12 PM
Description: Exception getting block type in world

java.lang.NullPointerException
	at ary.a(SourceFile:197)
	at ary.j(SourceFile:177)
	at ary.w_(SourceFile:300)
	at abw.a(SourceFile:1658)
	at adr.e(SourceFile:540)
	at adr.a(SourceFile:397)
	at abw.f(SourceFile:306)
	at afp.a(SourceFile:96)
	at aet.a(SourceFile:451)
	at jr.a(SourceFile:168)
	at adr.a(SourceFile:723)
	at jr.c(SourceFile:105)
	at jr.d(SourceFile:116)
	at abw.e(SourceFile:289)
	at abw.a(SourceFile:213)
	at ary.a(SourceFile:197)
	at ary.j(SourceFile:177)
	at ary.h(SourceFile:205)
	at abw.h(SourceFile:1267)
	at js.h(SourceFile:364)
	at net.minecraft.server.MinecraftServer.t(SourceFile:471)
	at net.minecraft.server.MinecraftServer.s(SourceFile:406)
	at bkz.s(SourceFile:124)
	at net.minecraft.server.MinecraftServer.run(SourceFile:340)
	at hi.run(SourceFile:583)


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

-- Head --
Stacktrace:
	at ary.a(SourceFile:197)
	at ary.j(SourceFile:177)
	at ary.w_(SourceFile:300)
	at abw.a(SourceFile:1658)
	at adr.e(SourceFile:540)
	at adr.a(SourceFile:397)
	at abw.f(SourceFile:306)
	at afp.a(SourceFile:96)
	at aet.a(SourceFile:451)
	at jr.a(SourceFile:168)
	at adr.a(SourceFile:723)
	at jr.c(SourceFile:105)
	at jr.d(SourceFile:116)
	at abw.e(SourceFile:289)

-- Requested block coordinates --
Details:
	Found chunk: true
	Location: World: (-577,27,-262), Chunk: (at 15,1,10 in -37,-17; contains blocks -592,0,-272 to -577,255,-257), Region: (-2,-1; contains chunks -64,-32 to -33,-1, blocks -1024,0,-512 to -513,255,-1)
Stacktrace:
	at abw.a(SourceFile:213)
	at ary.a(SourceFile:197)
	at ary.j(SourceFile:177)
	at ary.h(SourceFile:205)

-- Tile entity being ticked --
Details:
	Name: Chest // ary
	Block type: ID #54 (tile.chest // ank)
	Block data value: 4 / 0x4 / 0b0100
	Block location: World: (-576,27,-262), Chunk: (at 0,1,10 in -36,-17; contains blocks -576,0,-272 to -561,255,-257), Region: (-2,-1; contains chunks -64,-32 to -33,-1, blocks -1024,0,-512 to -513,255,-1)
	Actual block type: ID #54 (tile.chest // ank)
	Actual block data value: 4 / 0x4 / 0b0100
Stacktrace:
	at abw.h(SourceFile:1267)
	at js.h(SourceFile:364)

-- Affected level --
Details:
	Level name: nico
	All players: 1 total; [jv['djbryan'/91, l='nico', x=-468.16, y=68.00, z=-96.08]]
	Chunk stats: ServerChunkCache: 769 Drop: 0
	Level seed: 29944734968684659
	Level generator: ID 00 - default, ver 1. Features enabled: true
	Level generator options: 
	Level spawn location: World: (-252,64,32), Chunk: (at 4,4,0 in -16,2; contains blocks -256,0,32 to -241,255,47), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
	Level time: 16119 game time, 16119 day time
	Level dimension: 0
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 92582 (now: false), thunder time: 30936 (now: false)
	Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
Stacktrace:
	at net.minecraft.server.MinecraftServer.t(SourceFile:471)
	at net.minecraft.server.MinecraftServer.s(SourceFile:406)
	at bkz.s(SourceFile:124)
	at net.minecraft.server.MinecraftServer.run(SourceFile:340)
	at hi.run(SourceFile:583)

-- System Details --
Details:
	Minecraft Version: 1.6.4
	Operating System: Windows 8 (x86) version 6.2
	Java Version: 1.7.0_25, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
	Memory: 59040152 bytes (56 MB) / 291725312 bytes (278 MB) up to 518979584 bytes (494 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M
	AABB Pool Size: 4812 (269472 bytes; 0 MB) allocated, 3739 (209384 bytes; 0 MB) used
	Suspicious classes: No suspicious classes found.
	IntCache: cache: 2, tcache: 0, allocated: 1, tallocated: 63
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 5037 (282072 bytes; 0 MB) allocated, 4029 (225624 bytes; 0 MB) used
	Player Count: 1 / 8; [jv['djbryan'/91, l='nico', x=-468.16, y=68.00, z=-96.08]]
	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-190585/12371297/