[20:24:35 ERROR]: Could not pass event PlayerJoinEvent to McDuels v16.6.1
org.bukkit.event.EventException
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:309) ~[duels.jar:git-TacoSpigot-bf023c7d]
        at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:78) ~[duels.jar:git-TacoSpigot-bf023c7d]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[duels.jar:git-TacoSpigot-bf023c7d]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:508) [duels.jar:git-TacoSpigot-bf023c7d]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:493) [duels.jar:git-TacoSpigot-bf023c7d]
        at net.minecraft.server.v1_8_R3.PlayerList.onPlayerJoin(PlayerList.java:311) [duels.jar:git-TacoSpigot-bf023c7d]
        at net.minecraft.server.v1_8_R3.PlayerList.a(PlayerList.java:170) [duels.jar:git-TacoSpigot-bf023c7d]
        at net.minecraft.server.v1_8_R3.LoginListener.b(LoginListener.java:144) [duels.jar:git-TacoSpigot-bf023c7d]
        at net.minecraft.server.v1_8_R3.LoginListener.c(LoginListener.java:54) [duels.jar:git-TacoSpigot-bf023c7d]
        at net.minecraft.server.v1_8_R3.NetworkManager.a(NetworkManager.java:231) [duels.jar:git-TacoSpigot-bf023c7d]
        at net.minecraft.server.v1_8_R3.ServerConnection.c(ServerConnection.java:148) [duels.jar:git-TacoSpigot-bf023c7d]
        at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:886) [duels.jar:git-TacoSpigot-bf023c7d]
        at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:427) [duels.jar:git-TacoSpigot-bf023c7d]
        at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:724) [duels.jar:git-TacoSpigot-bf023c7d]
        at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:627) [duels.jar:git-TacoSpigot-bf023c7d]
        at java.lang.Thread.run(Thread.java:748) [?:1.8.0_201]
Caused by: java.util.ConcurrentModificationException
        at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:909) ~[?:1.8.0_201]
        at java.util.ArrayList$Itr.next(ArrayList.java:859) ~[?:1.8.0_201]
        at me.stevie212.McDuels.Managers.PlayersDataManager.isPlayerRegistered(PlayersDataManager.java:29) ~[?:?]
        at me.stevie212.McDuels.Listeners.PlayerJoinEventListener.onJoinEventSQL(PlayerJoinEventListener.java:48) ~[?:?]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_201]
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_201]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_201]
        at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_201]
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:307) ~[duels.jar:git-TacoSpigot-bf023c7d]
        ... 15 more
[20:24:35 INFO]: SteviePlaysMc4[/] logged in with entity id 57 at ([duels]-4.206208498447212, 99.0, 12.255295045282573)
[20:24:36 WARN]: [McDuels] Task #36 for McDuels v16.6.1 generated an exception
java.util.ConcurrentModificationException
        at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:909) ~[?:1.8.0_201]
        at java.util.ArrayList$Itr.next(ArrayList.java:859) ~[?:1.8.0_201]
        at me.stevie212.McDuels.Managers.PlayersDataManager.isPlayerRegistered(PlayersDataManager.java:29) ~[?:?]
        at me.stevie212.McDuels.Managers.StatsManager.getEloGlobal(StatsManager.java:162) ~[?:?]
        at me.stevie212.McDuels.Util.ScoreBoard.replaceMent(ScoreBoard.java:51) ~[?:?]
        at me.stevie212.McDuels.Util.ScoreBoard$1.run(ScoreBoard.java:33) ~[?:?]
        at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftTask.run(CraftTask.java:59) ~[duels.jar:git-TacoSpigot-bf023c7d]
        at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:349) [duels.jar:git-TacoSpigot-bf023c7d]
        at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:794) [duels.jar:git-TacoSpigot-bf023c7d]
        at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:427) [duels.jar:git-TacoSpigot-bf023c7d]
        at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:724) [duels.jar:git-TacoSpigot-bf023c7d]
        at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:627) [duels.jar:git-TacoSpigot-bf023c7d]
        at java.lang.Thread.run(Thread.java:748) [?:1.8.0_201]
[20:24:41 WARN]: [McDuels] Task #36 for McDuels v16.6.1 generated an exception
java.util.ConcurrentModificationException
        at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:909) ~[?:1.8.0_201]
        at java.util.ArrayList$Itr.next(ArrayList.java:859) ~[?:1.8.0_201]
        at me.stevie212.McDuels.Managers.PlayersDataManager.isPlayerRegistered(PlayersDataManager.java:29) ~[?:?]
        at me.stevie212.McDuels.Managers.StatsManager.getEloGlobal(StatsManager.java:162) ~[?:?]
        at me.stevie212.McDuels.Util.ScoreBoard.replaceMent(ScoreBoard.java:51) ~[?:?]
        at me.stevie212.McDuels.Util.ScoreBoard$1.run(ScoreBoard.java:33) ~[?:?]
        at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftTask.run(CraftTask.java:59) ~[duels.jar:git-TacoSpigot-bf023c7d]
        at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:349) [duels.jar:git-TacoSpigot-bf023c7d]
        at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:794) [duels.jar:git-TacoSpigot-bf023c7d]
        at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:427) [duels.jar:git-TacoSpigot-bf023c7d]
        at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:724) [duels.jar:git-TacoSpigot-bf023c7d]
        at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:627) [duels.jar:git-TacoSpigot-bf023c7d]
        at java.lang.Thread.run(Thread.java:748) [?:1.8.0_201]