Exception
java.util.ConcurrentModificationException
Stacktrace Head
	at java.util.ArrayList$Itr.checkForComodification(Unknown Source)
	at java.util.ArrayList$Itr.next(Unknown Source)
	at qh.a(SourceFile:400)
	at sd.a(SourceFile:812)
	at cwk.x(SourceFile:142)
	at net.minecraft.server.MinecraftServer.run(SourceFile:430)
	at java.lang.Thread.run(Unknown Source)
Number of reports
465 (Of which, none are public and currently available)
Version Affected
14w30b
Mod Status
Has been reproduced in an unmodified environment
JIRA Issue
MC-63072 - The fix has been released
Vanilla vs Mod