[17:25:59] [Server thread/ERROR]: Could not pass event InventoryClickEvent to AdvancedCustomMenu v4.2.2
org.bukkit.event.EventException: null
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:320) ~[Spigot.jar:git-Spigot-56f8471-56118c6]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:70) ~[Spigot.jar:git-Spigot-56f8471-56118c6]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:529) ~[Spigot.jar:git-Spigot-56f8471-56118c6]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:514) ~[Spigot.jar:git-Spigot-56f8471-56118c6]
        at net.minecraft.server.v1_14_R1.PlayerConnection.a(PlayerConnection.java:2133) ~[Spigot.jar:git-Spigot-56f8471-56118c6]
        at net.minecraft.server.v1_14_R1.PacketPlayInWindowClick.a(SourceFile:33) ~[Spigot.jar:git-Spigot-56f8471-56118c6]
        at net.minecraft.server.v1_14_R1.PacketPlayInWindowClick.a(SourceFile:10) ~[Spigot.jar:git-Spigot-56f8471-56118c6]
        at net.minecraft.server.v1_14_R1.PlayerConnectionUtils.lambda$0(PlayerConnectionUtils.java:19) ~[Spigot.jar:git-Spigot-56f8471-56118c6]
        at net.minecraft.server.v1_14_R1.TickTask.run(SourceFile:18) [Spigot.jar:git-Spigot-56f8471-56118c6]
        at net.minecraft.server.v1_14_R1.IAsyncTaskHandler.executeTask(SourceFile:144) [Spigot.jar:git-Spigot-56f8471-56118c6]
        at net.minecraft.server.v1_14_R1.IAsyncTaskHandlerReentrant.executeTask(SourceFile:23) [Spigot.jar:git-Spigot-56f8471-56118c6]
        at net.minecraft.server.v1_14_R1.IAsyncTaskHandler.executeNext(SourceFile:118) [Spigot.jar:git-Spigot-56f8471-56118c6]
        at net.minecraft.server.v1_14_R1.MinecraftServer.aX(MinecraftServer.java:909) [Spigot.jar:git-Spigot-56f8471-56118c6]
        at net.minecraft.server.v1_14_R1.MinecraftServer.executeNext(MinecraftServer.java:902) [Spigot.jar:git-Spigot-56f8471-56118c6]
        at net.minecraft.server.v1_14_R1.IAsyncTaskHandler.executeAll(SourceFile:103) [Spigot.jar:git-Spigot-56f8471-56118c6]
        at net.minecraft.server.v1_14_R1.MinecraftServer.sleepForTick(MinecraftServer.java:885) [Spigot.jar:git-Spigot-56f8471-56118c6]
        at net.minecraft.server.v1_14_R1.MinecraftServer.run(MinecraftServer.java:819) [Spigot.jar:git-Spigot-56f8471-56118c6]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_231]
Caused by: java.util.ConcurrentModificationException
        at java.util.Hashtable$Enumerator.next(Unknown Source) ~[?:1.8.0_231]
        at me.SuperRonanCraft.AdvancedCustomMenu.menus.handlers.list.activities.Delays.load(Delays.java:34) ~[?:?]
        at me.SuperRonanCraft.AdvancedCustomMenu.menus.handlers.list.activities.Delays.setPlayer(Delays.java:96) ~[?:?]
        at me.SuperRonanCraft.AdvancedCustomMenu.menus.handlers.list.activities.Delays.addPlayer(Delays.java:92) ~[?:?]
        at me.SuperRonanCraft.AdvancedCustomMenu.menus.handlers.list.activities.Delays.getDelay(Delays.java:77) ~[?:?]
        at me.SuperRonanCraft.AdvancedCustomMenu.menus.handlers.list.click.ClickHandler.delay(ClickHandler.java:351) ~[?:?]
        at me.SuperRonanCraft.AdvancedCustomMenu.menus.handlers.list.click.ClickHandler.beforeCmd(ClickHandler.java:88) ~[?:?]
        at me.SuperRonanCraft.AdvancedCustomMenu.menus.handlers.list.click.ClickHandler.check(ClickHandler.java:63) ~[?:?]
        at me.SuperRonanCraft.AdvancedCustomMenu.menus.handlers.list.click.ClickHandler.execute(ClickHandler.java:59) ~[?:?]
        at me.SuperRonanCraft.AdvancedCustomMenu.menus.handlers.Handler.click(Handler.java:32) ~[?:?]
        at me.SuperRonanCraft.AdvancedCustomMenu.events.Click.handler(Click.java:24) ~[?:?]
        at me.SuperRonanCraft.AdvancedCustomMenu.events.Click.click(Click.java:16) ~[?:?]
        at me.SuperRonanCraft.AdvancedCustomMenu.events.Listener.clickEvent(Listener.java:47) ~[?:?]
        at sun.reflect.GeneratedMethodAccessor368.invoke(Unknown Source) ~[?:?]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_231]
        at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_231]
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:316) ~[Spigot.jar:git-Spigot-56f8471-56118c6]
        ... 17 more