Could not pass event PlayerQuitEvent to AuthMe v3.0.1
org.bukkit.event.EventException
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:427)
	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
	at org.bukkit.plugin.TimedRegisteredListener.callEvent(TimedRegisteredListener.java:30)
	at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:478)
	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:463)
	at net.minecraft.server.v1_6_R3.PlayerList.disconnect(PlayerList.java:259)
	at net.minecraft.server.v1_6_R3.PlayerConnection.a(PlayerConnection.java:690)
	at org.spigotmc.netty.NettyNetworkManager.b(NettyNetworkManager.java:237)
	at net.minecraft.server.v1_6_R3.PlayerConnection.e(PlayerConnection.java:116)
	at net.minecraft.server.v1_6_R3.ServerConnection.b(SourceFile:37)
	at org.spigotmc.netty.NettyServerConnection.b(NettyServerConnection.java:132)
	at net.minecraft.server.v1_6_R3.MinecraftServer.t(MinecraftServer.java:594)
	at net.minecraft.server.v1_6_R3.DedicatedServer.t(DedicatedServer.java:240)
	at net.minecraft.server.v1_6_R3.MinecraftServer.s(MinecraftServer.java:483)
	at net.minecraft.server.v1_6_R3.MinecraftServer.run(MinecraftServer.java:415)
	at net.minecraft.server.v1_6_R3.ThreadServerApplication.run(SourceFile:583)
Caused by: java.util.ConcurrentModificationException
	at java.util.ArrayList$Itr.checkForComodification(Unknown Source)
	at java.util.ArrayList$Itr.next(Unknown Source)
	at org.yaml.snakeyaml.serializer.Serializer.anchorNode(Serializer.java:135)
	at org.yaml.snakeyaml.serializer.Serializer.anchorNode(Serializer.java:146)
	at org.yaml.snakeyaml.serializer.Serializer.serialize(Serializer.java:108)
	at org.yaml.snakeyaml.Yaml.dumpAll(Yaml.java:272)
	at org.yaml.snakeyaml.Yaml.dumpAll(Yaml.java:262)
	at org.yaml.snakeyaml.Yaml.dumpAll(Yaml.java:234)
	at org.yaml.snakeyaml.Yaml.dump(Yaml.java:209)
	at org.bukkit.configuration.file.YamlConfiguration.saveToString(YamlConfiguration.java:38)
	at org.bukkit.configuration.file.FileConfiguration.save(FileConfiguration.java:54)
	at fr.xephi.authme.settings.CustomConfiguration.save(CustomConfiguration.java:52)
	at fr.xephi.authme.listener.AuthMePlayerListener.onPlayerQuit(AuthMePlayerListener.java:717)
	at sun.reflect.GeneratedMethodAccessor79.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:425)
	... 15 more