---- Minecraft Crash Report ----
// Don't do that.

Time: 28.12.14 19:07
Description: Exception in server tick loop

java.lang.NullPointerException: Exception in server tick loop
	at azi.a(SourceFile:124)
	at azi.apply(SourceFile:121)
	at beh.a(SourceFile:53)
	at beh.apply(SourceFile:50)
	at bei.a(SourceFile:67)
	at bei.a(SourceFile:90)
	at azh.f(SourceFile:49)
	at azh.c(SourceFile:39)
	at bff.a(SourceFile:551)
	at aqr.a(SourceFile:290)
	at bif.b(SourceFile:20)
	at arv.a(SourceFile:261)
	at arv.a(SourceFile:49)
	at arj.a(SourceFile:389)
	at asn.a(SourceFile:56)
	at bgt.a(SourceFile:472)
	at qt.a(SourceFile:174)
	at bff.a(SourceFile:872)
	at qt.c(SourceFile:104)
	at net.minecraft.server.MinecraftServer.k(SourceFile:314)
	at cyk.a(SourceFile:111)
	at cyk.i(SourceFile:127)
	at net.minecraft.server.MinecraftServer.run(SourceFile:418)
	at java.lang.Thread.run(Thread.java:745)


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

-- System Details --
Details:
	Minecraft Version: 1.8.1
	Operating System: Windows 7 (amd64) version 6.1
	Java Version: 1.8.0_25, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 237174128 bytes (226 MB) / 488374272 bytes (465 MB) up to 2134114304 bytes (2035 MB)
	JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx2G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
	IntCache: cache: 1, tcache: 1, allocated: 12, tallocated: 94
	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.