whenever i die the game freezes and then i get a crash report

---- Minecraft Crash Report ----
// Why did you do that?

Time: 8/1/12 11:35 AM
Description: Exception in server tick loop

java.lang.ArrayIndexOutOfBoundsException: -1
	at vo.a(SourceFile:267)
	at aag.a(SourceFile:36)
	at abd.a(SourceFile:24)
	at xk.a(SourceFile:29)
	at xm.d(SourceFile:222)
	at gp.c(SourceFile:70)
	at gp.d(SourceFile:92)
	at uo.e(SourceFile:241)
	at uo.a(SourceFile:184)
	at uo.c(SourceFile:197)
	at uo.b(SourceFile:172)
	at xb.a(SourceFile:53)
	at gq.b(SourceFile:471)
	at gq.a(SourceFile:440)
	at uo.<init>(SourceFile:152)
	at gq.<init>(SourceFile:62)
	at axu.a(SourceFile:64)
	at axu.b(SourceFile:93)
	at net.minecraft.server.MinecraftServer.run(SourceFile:291)
	at ep.run(SourceFile:539)

Relevant Details:
- Minecraft Version: 1.3.1
- Operating System: Windows 7 (amd64) version 6.1
- Java Version: 1.6.0_24, Sun Microsystems Inc.
- Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Sun Microsystems Inc.
- Memory: 429178264 bytes (409 MB) / 540475392 bytes (515 MB) up to 954466304 bytes (910 MB)
- JVM Flags: 2 total; -Xms512m -Xmx1024m
- Type: Integrated Server
- Is Modded: Unknown (can't tell)
- Profiler Position: N/A (disabled)
- Player Count: 0 / 8; []