[11:41:09] [Server thread/ERROR]: Could not pass event AsyncPlayerChatEvent to TownyChat v0.71
java.util.ConcurrentModificationException: null
    at java.util.HashMap$HashIterator.nextNode(HashMap.java:1493) ~[?:?]
    at java.util.HashMap$KeyIterator.next(HashMap.java:1516) ~[?:?]
    at com.palmergames.bukkit.TownyChat.channels.StandardChannel.sendSpyMessage(StandardChannel.java:293) ~[?:?]
    at com.palmergames.bukkit.TownyChat.channels.StandardChannel.chatProcess(StandardChannel.java:186) ~[?:?]
    at com.palmergames.bukkit.TownyChat.listener.TownyChatPlayerListener.onPlayerChat(TownyChatPlayerListener.java:129) ~[?:?]
    at com.destroystokyo.paper.event.executor.asm.generated.GeneratedEventExecutor1198.execute(Unknown Source) ~[?:?]
    at org.bukkit.plugin.EventExecutor.lambda$create$1(EventExecutor.java:69) ~[patched_1.15.2.jar:git-Paper-348]
    at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:80) ~[patched_1.15.2.jar:git-Paper-348]
    at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:70) ~[patched_1.15.2.jar:git-Paper-348]
    at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:607) ~[patched_1.15.2.jar:git-Paper-348]
    at net.minecraft.server.v1_15_R1.PlayerConnection.chat(PlayerConnection.java:1774) ~[patched_1.15.2.jar:git-Paper-348]
    at org.bukkit.craftbukkit.v1_15_R1.entity.CraftPlayer.chat(CraftPlayer.java:455) ~[patched_1.15.2.jar:git-Paper-348]
    at com.palmergames.bukkit.TownyChat.Command.commandobjects.ChannelJoinAliasCommand.execute(ChannelJoinAliasCommand.java:79) ~[?:?]
    at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:159) ~[patched_1.15.2.jar:git-Paper-348]
    at org.bukkit.craftbukkit.v1_15_R1.CraftServer.dispatchCommand(CraftServer.java:761) ~[patched_1.15.2.jar:git-Paper-348]
    at net.minecraft.server.v1_15_R1.PlayerConnection.handleCommand(PlayerConnection.java:1861) ~[patched_1.15.2.jar:git-Paper-348]
    at net.minecraft.server.v1_15_R1.PlayerConnection.a(PlayerConnection.java:1669) ~[patched_1.15.2.jar:git-Paper-348]
    at net.minecraft.server.v1_15_R1.PacketPlayInChat.a(PacketPlayInChat.java:47) ~[patched_1.15.2.jar:git-Paper-348]
    at net.minecraft.server.v1_15_R1.PacketPlayInChat.a(PacketPlayInChat.java:5) ~[patched_1.15.2.jar:git-Paper-348]
    at net.minecraft.server.v1_15_R1.PlayerConnectionUtils.lambda$ensureMainThread$0(PlayerConnectionUtils.java:23) ~[patched_1.15.2.jar:git-Paper-348]
    at net.minecraft.server.v1_15_R1.TickTask.run(SourceFile:18) ~[patched_1.15.2.jar:git-Paper-348]
    at net.minecraft.server.v1_15_R1.IAsyncTaskHandler.executeTask(IAsyncTaskHandler.java:136) ~[patched_1.15.2.jar:git-Paper-348]
    at net.minecraft.server.v1_15_R1.IAsyncTaskHandlerReentrant.executeTask(SourceFile:23) ~[patched_1.15.2.jar:git-Paper-348]
    at net.minecraft.server.v1_15_R1.IAsyncTaskHandler.executeNext(IAsyncTaskHandler.java:109) ~[patched_1.15.2.jar:git-Paper-348]
    at net.minecraft.server.v1_15_R1.MinecraftServer.ba(MinecraftServer.java:1105) ~[patched_1.15.2.jar:git-Paper-348]
    at net.minecraft.server.v1_15_R1.MinecraftServer.executeNext(MinecraftServer.java:1098) ~[patched_1.15.2.jar:git-Paper-348]
    at net.minecraft.server.v1_15_R1.IAsyncTaskHandler.awaitTasks(IAsyncTaskHandler.java:119) ~[patched_1.15.2.jar:git-Paper-348]
    at net.minecraft.server.v1_15_R1.MinecraftServer.sleepForTick(MinecraftServer.java:1059) ~[patched_1.15.2.jar:git-Paper-348]
    at net.minecraft.server.v1_15_R1.MinecraftServer.run(MinecraftServer.java:974) ~[patched_1.15.2.jar:git-Paper-348]
    at java.lang.Thread.run(Thread.java:834) [?:?]