---- Minecraft Crash Report ----
// Why is it breaking :(

Time: 18/06/14 7:30 PM
Description: Executing command block

java.lang.NullPointerException: Executing command block
	at java.util.Collections.addAll(Unknown Source)
	at ad.b(SourceFile:152)
	at z.a(SourceFile:47)
	at akw.a(SourceFile:92)
	at aos.b(SourceFile:60)
	at oq.a(SourceFile:482)
	at oq.c(SourceFile:193)
	at net.minecraft.server.MinecraftServer.w(SourceFile:570)
	at net.minecraft.server.MinecraftServer.v(SourceFile:506)
	at cln.v(SourceFile:132)
	at net.minecraft.server.MinecraftServer.run(SourceFile:422)
	at java.lang.Thread.run(Unknown Source)


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

-- Head --
Stacktrace:
	at java.util.Collections.addAll(Unknown Source)
	at ad.b(SourceFile:152)
	at z.a(SourceFile:47)

-- Command to be executed --
Details:
	Command: /execute @e[type=Bat] ~ ~ ~ /clone -298 56 -537 -298 61 -537 ~ ~-8 ~ keep
	Name: @
Stacktrace:
	at akw.a(SourceFile:92)
	at aos.b(SourceFile:60)

-- Block being ticked --
Details:
	Block type: ID #137 (tile.commandBlock // aos)
	Block data value: 0 / 0x0 / 0b0000
	Block location: World: (-299,56,-537), Chunk: (at 5,3,7 in -19,-34; contains blocks -304,0,-544 to -289,255,-529), Region: (-1,-2; contains chunks -32,-64 to -1,-33, blocks -512,0,-1024 to -1,255,-513)
Stacktrace:
	at oq.a(SourceFile:482)
	at oq.c(SourceFile:193)

-- Affected level --
Details:
	Level name: Random Stuff
	All players: 0 total; []
	Chunk stats: ServerChunkCache: 625 Drop: 0
	Level seed: 6074676668547129985
	Level generator: ID 01 - flat, ver 0. Features enabled: true
	Level generator options: 3;minecraft:bedrock,3*minecraft:stone,52*minecraft:sandstone;2;
	Level spawn location: -301.00,57.00,-536.00 - World: (-301,57,-536), Chunk: (at 3,3,8 in -19,-34; contains blocks -304,0,-544 to -289,255,-529), Region: (-1,-2; contains chunks -32,-64 to -1,-33, blocks -512,0,-1024 to -1,255,-513)
	Level time: 218616 game time, 44797 day time
	Level dimension: 0
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 8251 (now: true), thunder time: 121678 (now: false)
	Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true
Stacktrace:
	at net.minecraft.server.MinecraftServer.w(SourceFile:570)
	at net.minecraft.server.MinecraftServer.v(SourceFile:506)
	at cln.v(SourceFile:132)
	at net.minecraft.server.MinecraftServer.run(SourceFile:422)
	at java.lang.Thread.run(Unknown Source)

-- System Details --
Details:
	Minecraft Version: 14w21b
	Operating System: Windows 8.1 (amd64) version 6.3
	Java Version: 1.8.0, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 2849025696 bytes (2717 MB) / 3061317632 bytes (2919 MB) up to 4772593664 bytes (4551 MB)
	JVM Flags: 3 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx5120m -Xms2560m
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	Profiler Position: N/A (disabled)
	Player Count: 0 / 8; []
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.