[19:42:52 ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'mmocore' in plugin MMOCore v1.0.13-SNAPSHOT
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:47) ~[patched_1.14.4.jar:git-Paper-199]
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:159) ~[patched_1.14.4.jar:git-Paper-199]
        at org.bukkit.craftbukkit.v1_14_R1.CraftServer.dispatchCommand(CraftServer.java:739) ~[patched_1.14.4.jar:git-Paper-199]
        at net.minecraft.server.v1_14_R1.PlayerConnection.handleCommand(PlayerConnection.java:1800) ~[patched_1.14.4.jar:git-Paper-199]
        at net.minecraft.server.v1_14_R1.PlayerConnection.a(PlayerConnection.java:1608) ~[patched_1.14.4.jar:git-Paper-199]
        at net.minecraft.server.v1_14_R1.PacketPlayInChat.a(PacketPlayInChat.java:47) ~[patched_1.14.4.jar:git-Paper-199]
        at net.minecraft.server.v1_14_R1.PacketPlayInChat.a(PacketPlayInChat.java:5) ~[patched_1.14.4.jar:git-Paper-199]
        at net.minecraft.server.v1_14_R1.PlayerConnectionUtils.lambda$ensureMainThread$0(PlayerConnectionUtils.java:23) ~[patched_1.14.4.jar:git-Paper-199]
        at net.minecraft.server.v1_14_R1.TickTask.run(SourceFile:18) ~[patched_1.14.4.jar:git-Paper-199]
        at net.minecraft.server.v1_14_R1.IAsyncTaskHandler.executeTask(IAsyncTaskHandler.java:136) ~[patched_1.14.4.jar:git-Paper-199]
        at net.minecraft.server.v1_14_R1.IAsyncTaskHandlerReentrant.executeTask(SourceFile:23) ~[patched_1.14.4.jar:git-Paper-199]
        at net.minecraft.server.v1_14_R1.IAsyncTaskHandler.executeNext(IAsyncTaskHandler.java:109) ~[patched_1.14.4.jar:git-Paper-199]
        at net.minecraft.server.v1_14_R1.MinecraftServer.aX(MinecraftServer.java:1013) ~[patched_1.14.4.jar:git-Paper-199]
        at net.minecraft.server.v1_14_R1.MinecraftServer.executeNext(MinecraftServer.java:1006) ~[patched_1.14.4.jar:git-Paper-199]
        at net.minecraft.server.v1_14_R1.IAsyncTaskHandler.awaitTasks(IAsyncTaskHandler.java:119) ~[patched_1.14.4.jar:git-Paper-199]
        at net.minecraft.server.v1_14_R1.MinecraftServer.sleepForTick(MinecraftServer.java:990) ~[patched_1.14.4.jar:git-Paper-199]
        at net.minecraft.server.v1_14_R1.MinecraftServer.run(MinecraftServer.java:923) ~[patched_1.14.4.jar:git-Paper-199]
        at java.lang.Thread.run(Thread.java:748) [?:1.8.0_222]
Caused by: java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
        at java.util.ArrayList.rangeCheck(ArrayList.java:657