Vtriggers error log

2012-10-08 02:14:21 [WARNING] [VariableTriggers] Task #15 for VariableTriggers v1.1.9 generated an exception
java.util.ConcurrentModificationException
	at java.util.HashMap$HashIterator.nextEntry(HashMap.java:806)
	at java.util.HashMap$KeyIterator.next(HashMap.java:841)
	at org.bukkit.permissions.PermissibleBase.clearPermissions(PermissibleBase.java:168)
	at org.bukkit.permissions.PermissibleBase.recalculatePermissions(PermissibleBase.java:149)
	at org.bukkit.craftbukkit.entity.CraftHumanEntity.recalculatePermissions(CraftHumanEntity.java:132)
	at org.getspout.spout.SpoutPermissibleBase.recalculatePermissions(SpoutPermissibleBase.java:92)
	at org.getspout.spout.player.SpoutCraftPlayer.recalculatePermissions(SpoutCraftPlayer.java:271)
	at net.minecraft.server.ServerConfigurationManagerAbstract.removeOp(ServerConfigurationManagerAbstract.java:568)
	at net.minecraft.server.ServerConfigurationManager.removeOp(SourceFile:49)
	at org.bukkit.craftbukkit.entity.CraftPlayer.setOp(CraftPlayer.java:79)
	at com.wizardscraft.scripting.UnsafeThreadRunner.run(UnsafeThreadRunner.java:84)
	at org.bukkit.craftbukkit.scheduler.CraftTask.run(CraftTask.java:52)
	at org.bukkit.craftbukkit.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:316)
	at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:510)
	at net.minecraft.server.DedicatedServer.q(DedicatedServer.java:213)
	at net.minecraft.server.MinecraftServer.p(MinecraftServer.java:474)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:406)
	at net.minecraft.server.ThreadServerApplication.run(SourceFile:539)