[09:33:35] [Craft Scheduler Thread - 236/WARN]: Exception in thread "Craft Scheduler Thread - 236"
[09:33:35] [Craft Scheduler Thread - 236/WARN]: org.apache.commons.lang.UnhandledException: Plugin PvPTimer v1.3 generated an exception while executing task 28
	at org.bukkit.craftbukkit.v1_7_R1.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:56)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:744)
Caused by: java.util.ConcurrentModificationException
	at java.util.HashMap$HashIterator.nextEntry(HashMap.java:926)
	at java.util.HashMap$KeyIterator.next(HashMap.java:960)
	at lemon42.PvPTimer.CheckTask.run(CheckTask.java:13)
	at org.bukkit.craftbukkit.v1_7_R1.scheduler.CraftTask.run(CraftTask.java:67)
	at org.bukkit.craftbukkit.v1_7_R1.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:53)
	... 3 more