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

Time: 06/06/14 06:55
Description: Executing command block

java.lang.NullPointerException: Executing command block
	at java.util.Collections.addAll(Collections.java:3526)
	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(Thread.java:695)


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

-- Head --
Stacktrace:
	at java.util.Collections.addAll(Collections.java:3526)
	at ad.b(SourceFile:152)
	at z.a(SourceFile:47)

-- Command to be executed --
Details:
	Command: /scoreboard players operation BasicSword Experience -= @a[score_BasicSword_min=1] Dealt
	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: 1 / 0x1 / 0b0001
	Block location: World: (-204,56,1458), Chunk: (at 4,3,2 in -13,91; contains blocks -208,0,1456 to -193,255,1471), Region: (-1,2; contains chunks -32,64 to -1,95, blocks -512,0,1024 to -1,255,1535)
Stacktrace:
	at oq.a(SourceFile:482)
	at oq.c(SourceFile:193)

-- Affected level --
Details:
	Level name: redstone
	All players: 0 total; []
	Chunk stats: ServerChunkCache: 651 Drop: 369
	Level seed: -7619446009420783957
	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: -214,00,4,00,1436,00 - World: (-214,4,1436), Chunk: (at 10,0,12 in -14,89; contains blocks -224,0,1424 to -209,255,1439), Region: (-1,2; contains chunks -32,64 to -1,95, blocks -512,0,1024 to -1,255,1535)
	Level time: 147171 game time, 6000 day time
	Level dimension: 0
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 17143 (now: false), thunder time: 84544 (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(Thread.java:695)

-- System Details --
Details:
	Minecraft Version: 14w21b
	Operating System: Mac OS X (x86_64) version 10.9.3
	Java Version: 1.6.0_65, Apple Inc.
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
	Memory: 510839632 bytes (487 MB) / 631812096 bytes (602 MB) up to 3216900096 bytes (3067 MB)
	JVM Flags: 1 total; -Xmx3G
	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.