---- Minecraft Crash Report ----
// There are four lights!

Time: 25/04/14 12:02 PM
Description: Exception in server tick loop

java.lang.IllegalArgumentException: n must be positive
	at java.util.Random.nextInt(Unknown Source)
	at ayy.a(SourceFile:442)
	at od.a(SourceFile:175)
	at axr.a(SourceFile:859)
	at od.c(SourceFile:104)
	at net.minecraft.server.MinecraftServer.i(SourceFile:269)
	at cim.a(SourceFile:94)
	at cim.g(SourceFile:110)
	at net.minecraft.server.MinecraftServer.run(SourceFile:367)
	at mu.run(SourceFile:667)


A detailed walkthrough of the error, its code path and all known details is as follows:
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-- System Details --
Details:
	Minecraft Version: 14w17a
	Operating System: Windows 7 (x86) version 6.1
	Java Version: 1.7.0_51, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
	Memory: 46173640 bytes (44 MB) / 107483136 bytes (102 MB) up to 518979584 bytes (494 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M
	IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 87
	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.