[08:41:17] [Server thread/ERROR]: Could not pass event PlayerJoinEvent to InsanityRun v2.3
org.bukkit.event.EventException
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:427) ~[spigot-1.7.jar:git-Spigot-1178]
	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[spigot-1.7.jar:git-Spigot-1178]
	at org.bukkit.plugin.TimedRegisteredListener.callEvent(TimedRegisteredListener.java:30) ~[spigot-1.7.jar:git-Spigot-1178]
	at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:478) [spigot-1.7.jar:git-Spigot-1178]
	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:463) [spigot-1.7.jar:git-Spigot-1178]
	at net.minecraft.server.v1_7_R1.PlayerList.c(PlayerList.java:225) [spigot-1.7.jar:git-Spigot-1178]
	at net.minecraft.server.v1_7_R1.PlayerList.a(PlayerList.java:116) [spigot-1.7.jar:git-Spigot-1178]
	at net.minecraft.server.v1_7_R1.LoginListener.c(LoginListener.java:78) [spigot-1.7.jar:git-Spigot-1178]
	at net.minecraft.server.v1_7_R1.LoginListener.a(LoginListener.java:42) [spigot-1.7.jar:git-Spigot-1178]
	at net.minecraft.server.v1_7_R1.NetworkManager.a(NetworkManager.java:149) [spigot-1.7.jar:git-Spigot-1178]
	at net.minecraft.server.v1_7_R1.ServerConnection.c(SourceFile:134) [spigot-1.7.jar:git-Spigot-1178]
	at net.minecraft.server.v1_7_R1.MinecraftServer.u(MinecraftServer.java:647) [spigot-1.7.jar:git-Spigot-1178]
	at net.minecraft.server.v1_7_R1.DedicatedServer.u(DedicatedServer.java:259) [spigot-1.7.jar:git-Spigot-1178]
	at net.minecraft.server.v1_7_R1.MinecraftServer.t(MinecraftServer.java:530) [spigot-1.7.jar:git-Spigot-1178]
	at net.minecraft.server.v1_7_R1.MinecraftServer.run(MinecraftServer.java:442) [spigot-1.7.jar:git-Spigot-1178]
	at net.minecraft.server.v1_7_R1.ThreadServerApplication.run(SourceFile:617) [spigot-1.7.jar:git-Spigot-1178]
Caused by: java.util.ConcurrentModificationException
	at java.util.HashMap$HashIterator.nextEntry(Unknown Source) ~[?:1.7.0_17]
	at java.util.HashMap$KeyIterator.next(Unknown Source) ~[?:1.7.0_17]
	at com.obsidianloft.insanityrun.events.PlayerListener.onJoin(PlayerListener.java:221) ~[?:?]
	at sun.reflect.GeneratedMethodAccessor514.invoke(Unknown Source) ~[?:?]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0_17]
	at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.7.0_17]
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:425) ~[spigot-1.7.jar:git-Spigot-1178]
	... 15 more