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My son runs multiple servers and last night one of his favorite worlds crashed. All the other worlds continue to work making me think this is not graphics card issue. Here is the error report can anyone help?

[INFO] Starting minecraft server version 1.4.2
[INFO] Loading properties
[INFO] Default game type: SURVIVAL
[INFO] Generating keypair
[INFO] Starting Minecraft server on *:25565
[INFO] Preparing level "world"
[INFO] Preparing start region for level 0
[INFO] Preparing spawn area: 1%
[INFO] Preparing spawn area: 65%
[INFO] Done (2.703s)! For help, type "help" or "?"
[INFO] candle2011[/68.6.206.232:49241] logged in with entity id 282 at (34.746548379563514, 75.11435596545438, 13.174330612897013)
[SEVERE] Encountered an unexpected exception IllegalStateException
java.lang.IllegalStateException: Entity is already tracked!
at hz.a(SourceFile:67)
at hz.a(SourceFile:56)
at ia.a(SourceFile:24)
at xe.a(SourceFile:786)
at ie.a(SourceFile:553)
at xe.d(SourceFile:778)
at ge.a(SourceFile:355)
at lb.b(SourceFile:1442)
at alc.a(SourceFile:62)
at lb.D(SourceFile:659)
at lb.d(SourceFile:622)
at lj.j_(SourceFile:111)
at xe.a(SourceFile:1218)
at ie.a(SourceFile:424)
at xe.g(SourceFile:1197)
at xe.h(SourceFile:1122)
at ie.h(SourceFile:352)
at net.minecraft.server.MinecraftServer.r(SourceFile:718)
at hg.r(SourceFile:233)
at net.minecraft.server.MinecraftServer.q(SourceFile:661)
at net.minecraft.server.MinecraftServer.run(SourceFile:595)
at fp.run(SourceFile:818)

The world was the problem. Duplicated the error several times last night. This morning the world was completely back to normal. Thanks for asking.