java.util.ConcurrentModificationException: This exception has no message.

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java.util.ConcurrentModificationException	at java.util.ArrayDeque$DeqIterator.next(Unknown Source)	at cn.nukkit.timings.TimingsExport.reportTimings(TimingsExport.java:82)	at cn.nukkit.command.defaults.TimingsCommand.execute(TimingsCommand.java:63)	at cn.nukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:225)	at cn.nukkit.Server.dispatchCommand(Server.java:630)	at cn.nukkit.command.CommandReader.run(CommandReader.java:70)