---- Minecraft Crash Report ----
// Oh - I know what I did wrong!

Time: 6/19/14 4:22 PM
Description: Executing command block

java.lang.NullPointerException: Executing command block
	at java.util.Collections.addAll(Unknown Source)
	at af.b(SourceFile:152)
	at ab.a(SourceFile:47)
	at alg.a(SourceFile:92)
	at apb.c(SourceFile:56)
	at ou.a(SourceFile:466)
	at ou.c(SourceFile:176)
	at net.minecraft.server.MinecraftServer.w(SourceFile:570)
	at net.minecraft.server.MinecraftServer.v(SourceFile:506)
	at coe.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 af.b(SourceFile:152)
	at ab.a(SourceFile:47)

-- Command to be executed --
Details:
	Command: execute @e[type=WitherSkull] ~ ~ ~ particle happyVillager ~ ~1 ~ 0.3 4 0.3 0 5
	Name: @
Stacktrace:
	at alg.a(SourceFile:92)
	at apb.c(SourceFile:56)

-- Block being ticked --
Details:
	Block type: ID #137 (tile.commandBlock // apb)
	Block data value: 1 / 0x1 / 0b0001
	Block location: World: (203,56,974), Chunk: (at 11,3,14 in 12,60; contains blocks 192,0,960 to 207,255,975), Region: (0,1; contains chunks 0,32 to 31,63, blocks 0,0,512 to 511,255,1023)
Stacktrace:
	at ou.a(SourceFile:466)
	at ou.c(SourceFile:176)

-- Affected level --
Details:
	Level name: Test world
	All players: 0 total; []
	Chunk stats: ServerChunkCache: 1122 Drop: 833
	Level seed: -7667744409386397173
	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: 222.00,4.00,995.00 - World: (222,4,995), Chunk: (at 14,0,3 in 13,62; contains blocks 208,0,992 to 223,255,1007), Region: (0,1; contains chunks 0,32 to 31,63, blocks 0,0,512 to 511,255,1023)
	Level time: 304994 game time, 291262 day time
	Level dimension: 0
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 74046 (now: false), thunder time: 103834 (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 coe.v(SourceFile:132)
	at net.minecraft.server.MinecraftServer.run(SourceFile:422)
	at java.lang.Thread.run(Unknown Source)

-- System Details --
Details:
	Minecraft Version: 14w25b
	Operating System: Windows 7 (amd64) version 6.1
	Java Version: 1.7.0_13, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 248275136 bytes (236 MB) / 413859840 bytes (394 MB) up to 954466304 bytes (910 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
	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.