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---- Minecraft Crash Report ----
// You're mean.

Time: 8/20/15 3:25 PM
Description: Executing command block

java.lang.NullPointerException: Executing command block
at java.util.Collections.addAll(Collections.java:5400)
at o.a(SourceFile:151)
at o.b(SourceFile:119)
at j.a(SourceFile:49)
at aga.a(SourceFile:100)
at aiy.b(SourceFile:91)
at lk.a(SourceFile:553)
at lk.d(SourceFile:198)
at net.minecraft.server.MinecraftServer.D(SourceFile:617)
at net.minecraft.server.MinecraftServer.C(SourceFile:553)
at buq.C(SourceFile:152)
at net.minecraft.server.MinecraftServer.run(SourceFile:457)
at java.lang.Thread.run(Thread.java:745)

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:5400)
at o.a(SourceFile:151)
at o.b(SourceFile:119)
at j.a(SourceFile:49)

-- Command to be executed --
Details:
Command: /xp 500 @a[score_KillPoints_min=1000,score_KillPoints=1000]
Name: @
Stacktrace:
at aga.a(SourceFile:100)
at aiy.b(SourceFile:91)

-- Block being ticked --
Details:
Block: minecraft:command_block[facing=up]
Block location: World: (-1235,57,507), Chunk: (at 13,3,11 in -78,31; contains blocks -1248,0,496 to -1233,255,511), Region: (-3,0; contains chunks -96,0 to -65,31, blocks -1536,0,0 to -1025,255,511)
Stacktrace:
at lk.a(SourceFile:553)
at lk.d(SourceFile:198)

-- Affected level --
Details:
Level name: Minecraft Brawl
All players: 0 total; []
Chunk stats: ServerChunkCache: 1254 Drop: 629
Level seed: 2765233229893963676
Level generator: ID 01 - flat, ver 0. Features enabled: false
Level generator options: 3;minecraft:air;1;village
Level spawn location: -1249.00,56.00,496.00 - World: (-1249,56,496), Chunk: (at 15,3,0 in -79,31; contains blocks -1264,0,496 to -1249,255,511), Region: (-3,0; contains chunks -96,0 to -65,31, blocks -1536,0,0 to -1025,255,511)
Level time: 16097442 game time, 546722 day time
Level dimension: 0
Level storage version: 0x04ABD - Anvil
Level weather: Rain time: 1 (now: false), thunder time: 1 (now: false)
Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: true
Stacktrace:
at net.minecraft.server.MinecraftServer.D(SourceFile:617)
at net.minecraft.server.MinecraftServer.C(SourceFile:553)
at buq.C(SourceFile:152)
at net.minecraft.server.MinecraftServer.run(SourceFile:457)
at java.lang.Thread.run(Thread.java:745)

-- System Details --
Details:
Minecraft Version: 15w34b
Operating System: Windows 10 (amd64) version 10.0
Java Version: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 344429840 bytes (328 MB) / 468189184 bytes (446 MB) up to 1908932608 bytes (1820 MB)
JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx2G
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.