org.bukkit.event.EventException: null

problem
with error code -org.bukkit.event.EventException: null
here is the main code

Code:

package hahamine.syntax;

import org.bukkit.event.EventHandler;
import org.bukkit.entity.Player;
import org.bukkit.event.player.PlayerCommandPreprocessEvent;
import net.md_5.bungee.api.ChatColor;
import org.bukkit.Bukkit;
import org.bukkit.configuration.file.FileConfiguration;
import org.bukkit.plugin.Plugin;
import org.bukkit.event.Listener;
import org.bukkit.plugin.java.JavaPlugin;

public class main extends JavaPlugin implements Listener
{
    public static Plugin plugin;
    public static FileConfiguration config;
   
    public void onEnable() {
        Bukkit.getConsoleSender().sendMessage(ChatColor.GREEN + "HaHaMiNeSyntax Enabled! Plugin redone player Khamitov - §evk.com/Khamitov0312");
        this.getServer().getPluginManager().registerEvents((Listener)this, (Plugin)this);
        main.plugin = (Plugin)this;
        ConfigHandler.configInit();
    }
   
    public void onDisable() {
        Bukkit.getConsoleSender().sendMessage(ChatColor.RED + "HaHaMiNeSyntax Disable! Plugin redone player Khamitov - §evk.com/khamitov0312");
    }
   
    @EventHandler
    public void onCommand(final PlayerCommandPreprocessEvent e) {
        final Player player = e.getPlayer();
        if (e.getMessage().split(" ")[0].contains(":") && !player.hasPermission("hahaminesyntax.allow")) {
            e.setCancelled(true);
            e.getPlayer().sendMessage(ChatColor.translateAlternateColorCodes('&', main.config.getString("Message.HaHaMineSyntax")));
            player.playSound(player.getLocation(), Sounds.VILLAGER_NO.bukkitSound(), 2.0f, 1.0f);
        }
    }
   
    @EventHandler
    public void onCommand1(final PlayerCommandPreprocessEvent e) {
        final Player player = e.getPlayer();
        if (e.getMessage().split(" ")[0].contains(".") && !player.hasPermission("hahaminesyntax.allow")) {
            e.setCancelled(true);
            e.getPlayer().sendMessage(ChatColor.translateAlternateColorCodes('&', main.config.getString("Message.HaHaMineSyntax")));
            player.playSound(player.getLocation(), Sounds.VILLAGER_NO.bukkitSound(), 2.0f, 1.0f);
        }
    }
   
    @EventHandler
    public void onCommand2(final PlayerCommandPreprocessEvent e) {
        final Player player = e.getPlayer();
        if (e.getMessage().split(" ")[0].contains("*") && !player.hasPermission("hahaminesyntax.allow")) {
            e.setCancelled(true);
            e.getPlayer().sendMessage(ChatColor.translateAlternateColorCodes('&', main.config.getString("Message.HaHaMineSyntax")));
            player.playSound(player.getLocation(), Sounds.ZOMBIE_PIG_DEATH.bukkitSound(), 2.0f, 1.0f);
        }
    }
   
   
    public void onCommand3(final PlayerCommandPreprocessEvent e) {
        final Player player = e.getPlayer();
        if (e.getMessage().split(" ")[1].contains(":") && !player.hasPermission("hahaminesyntax.allow")) {
            e.setCancelled(true);
            e.getPlayer().sendMessage(ChatColor.translateAlternateColorCodes('&', main.config.getString("Message.HaHaMineSyntax")));
            player.playSound(player.getLocation(), Sounds.VILLAGER_NO.bukkitSound(), 2.0f, 1.0f);
        }
    }
   
    @EventHandler
    public void onCommand4(final PlayerCommandPreprocessEvent e) {
        final Player player = e.getPlayer();
        if (e.getMessage().split(" ")[1].contains(".") && !player.hasPermission("hahaminesyntax.allow")) {
            e.setCancelled(true);
            e.getPlayer().sendMessage(ChatColor.translateAlternateColorCodes('&', main.config.getString("Message.HaHaMineSyntax")));
            player.playSound(player.getLocation(), Sounds.VILLAGER_NO.bukkitSound(), 2.0f, 1.0f);
        }
    }
   
    @EventHandler
    public void onCommand5(final PlayerCommandPreprocessEvent e) {
        final Player player = e.getPlayer();
        if (e.getMessage().split(" ")[1].contains("*") && !player.hasPermission("hahaminesyntax.allow")) {
            e.setCancelled(true);
            e.getPlayer().sendMessage(ChatColor.translateAlternateColorCodes('&', main.config.getString("Message.HaHaMineSyntax")));
            player.playSound(player.getLocation(), Sounds.ZOMBIE_PIG_DEATH.bukkitSound(), 2.0f, 1.0f);
        }
    }
    @EventHandler
    public void onCommand6(final PlayerCommandPreprocessEvent e) {
        final Player player = e.getPlayer();
        if (e.getMessage().split(" ")[0].contains("u") && !player.hasPermission("hahaminesyntax.allow")) {
            e.setCancelled(true);
            e.getPlayer().sendMessage(ChatColor.translateAlternateColorCodes('&', main.config.getString("Message.HaHaMineSyntax")));
            player.playSound(player.getLocation(), Sounds.ZOMBIE_DEATH.bukkitSound(), 2.0f, 1.0f);
        }
    }
    @EventHandler
    public void onCommand7(final PlayerCommandPreprocessEvent e) {
        final Player player = e.getPlayer();
        if (e.getMessage().split(" ")[1].contains("u") && !player.hasPermission("hahaminesyntax.allow")) {
            e.setCancelled(true);
            e.getPlayer().sendMessage(ChatColor.translateAlternateColorCodes('&', main.config.getString("Message.HaHaMineSyntax")));
            player.playSound(player.getLocation(), Sounds.ZOMBIE_DEATH.bukkitSound(), 2.0f, 1.0f);
        }
    }
}

if necessary, I can throw off other dependencies

EDIT by Moderator: merged posts, please use the edit button instead of double posting.

 

I don't know where the error is. the plugin writes null to the console. and eventually shuts down the server

 

https://pastebin.com/EW78ssz3

 

I found a bug.
the point is that it should work that like.
/ban * (denied)
/ban* (denied) but causes the error.

 

I did it using the if function.
as you said)