public boolean authorizeSender() {
        if (mustBePlayer && !(sender instanceof Player)) {
            sender.sendMessage(OITG.prefix + ChatColor.RED + "Only players can run that command.");
            return false;
        }
        if (sender instanceof Player && permission != null && !sender.hasPermission(permission)) {
            sender.sendMessage(OITG.prefix + ChatColor.RED + "Access denied!");
            return false;
        }
        return true;
    }