Minecraft crash log

crash-2013-03-28-server

---- Minecraft Crash Report ----
// I'm sorry, Dave.

Time: 3/28/13 10:04 AM
Description: Ticking memory connection

java.lang.ArrayIndexOutOfBoundsException: -1
  at java.util.ArrayList.fastRemove(ArrayList.java:441)
	at java.util.ArrayList.remove(ArrayList.java:424)
	at ix.sendThisChunkToPlayer(PlayerInstance.java:78)
	at iw.c(PlayerManager.java:296)
	at gu.e(SourceFile:208)
	at jh.a(SourceFile:405)
	at ch.b(SourceFile:67)
	at jh.d(SourceFile:60)
	at jk.b(SourceFile:35)
	at bjk.b(SourceFile:84)
	at net.minecraft.server.MinecraftServer.r(SourceFile:480)
	at net.minecraft.server.MinecraftServer.q(SourceFile:397)
	at bjh.q(IntegratedServer.java:171)
	at net.minecraft.server.MinecraftServer.run(SourceFile:331)
	at gp.run(SourceFile:573)


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

-- System Details --
Details:
	Minecraft Version: 1.5.1
	Operating System: Mac OS X (x86_64) version 10.8.3
	Java Version: 1.6.0_43, Apple Inc.
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
	Memory: 391627904 bytes (373 MB) / 530186240 bytes (505 MB) up to 530186240 bytes (505 MB)
	JVM Flags: 2 total; -Xms512m -Xmx512m
	AABB Pool Size: 3518 (197008 bytes; 0 MB) allocated, 3226 (180656 bytes; 0 MB) used
	Suspicious classes: IWrUpdater, Config, WrUpdates, ...]
	IntCache: cache: 0, tcache: 0, allocated: 3, tallocated: 63
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 1030 (57680 bytes; 0 MB) allocated, 828 (46368 bytes; 0 MB) used
	Player Count: 0 / 8; []
	Type: Integrated Server (map_client.txt)
	Is Modded: Very likely; Jar signature invalidated