Event output is duplicating

I'm trying to make Inv menu but every time someone opens it the output form onInventoryClikc will duplicate.
Here's my code:

Code:

public class MainMenu implements Listener {
   
    private Inventory inv;
    private ItemStack infinit, timed,  derank;
    private Plugin plugin = MainClass.getPlugin(MainClass.class);
    public Player getPlayerName;
   
    public MainMenu (Plugin p, Player playerName) {
       
        getPlayerName = playerName;
        inv = Bukkit.getServer().createInventory(null, 9, ChatColor.AQUA + "" + ChatColor.BOLD + "Rank Picker");
       
        infinit = createChest(ChatColor.LIGHT_PURPLE + "Full-time rank", "54", "Non-timed rank");
        timed = createChest(ChatColor.LIGHT_PURPLE + "Timed rank", "54", "Timed rank");
        derank = createChest(ChatColor.LIGHT_PURPLE + "Derank", "54", "Remove rank");
       
        inv.setItem(0, infinit);
        inv.setItem(1, timed);
        inv.setItem(2, derank);
        System.out.println("4");
       
        Bukkit.getServer().getPluginManager().registerEvents(this, p);
       
    }
   
    private ItemStack createChest(String name, String meta, String lore) {
        Material item = Material.CHEST;
        ItemStack i = new ItemStack(item, 1);
        ItemMeta im = i.getItemMeta();
        im.setDisplayName(name);
        im.setLore(Arrays.asList(lore));
        i.setItemMeta(im);
        return i;
       
    }
   
    public void show (Player p) {
        p.openInventory(inv);
       
    }
   
    public String rankPick;
    @EventHandler
    public void onInventoryClicl(InventoryClickEvent e) {
        Commands commands = new Commands();
        if (!e.getInventory().getName().equalsIgnoreCase(inv.getName())) return;
        if (e.getCurrentItem().getItemMeta().getDisplayName().contains("Full-time rank")) {
            e.setCancelled(true);
            rankPick = "FillTime";
           
        }
        if (e.getCurrentItem().getItemMeta().getDisplayName().contains("Timed rank")) {
            e.setCancelled(true);
            rankPick = "Timed";
           
        }
        if (e.getCurrentItem().getItemMeta().getDisplayName().contains("Derank")) {
            e.setCancelled(true);
            rankPick = "Demote";
           
        }
       
        SubMenu smenu = new SubMenu(plugin, (Player)e.getWhoClicked());
        smenu.show((Player)e.getWhoClicked());   

    }
   
}

When i open the menu the output duplicates

 

How do i unregister the event?

 

What of you mean?

 

You're not really doing anything with the player's name so you won't need the Player at all.
Register the event listener inside your main class within onEnable once and leave it out of this class or look into HandlerList and unregister it using that.