Ошибка Notice: Undefined offset: -1 in

<?php
/*-------------------------------------------------------+
| PHP-Fusion Content Management System
| Copyright (C) 2002 - 2008 Nick Jones
| http://www.php-fusion.co.uk/
+--------------------------------------------------------+
| Filename: panels.php
| Author: Nick Jones (Digitanium)
+--------------------------------------------------------+
| This program is released as free software under the
| Affero GPL license. You can redistribute it and/or
| modify it under the terms of this license which you
| can read by viewing the included agpl.txt or online
| at www.gnu.org/licenses/agpl.html. Removal of this
| copyright header is strictly prohibited without
| written permission from the original author(s).
+--------------------------------------------------------*/
if (!defined("IN_FUSION")) { header("Location: ../../index.php"); exit; }
 
// Calculate current true url
$script_url = explode("/", $_SERVER['PHP_SELF'].(FUSION_QUERY ? "?".FUSION_QUERY : ""));
$url_count = count($script_url);
$base_url_count = substr_count(BASEDIR, "/") + 1;
$start_page = "";
while ($base_url_count != 0) {
    $current = $url_count - $base_url_count;
    $start_page .= "/".$script_url[$current];
    $base_url_count--;
}
 
define("START_PAGE", substr(preg_replace("#(&amp;|\?)(s_action=edit&amp;shout_id=)([0-9]+)#s", "", $start_page), 1));
 
// Side & center panels
ob_start();
$plc = 0;
 
// Render left panels
if(!defined("ADMIN_PANEL")){
    if (check_panel_status("left")) {
        $p_res = dbquery("SELECT * FROM ".DB_PANELS." WHERE panel_side='1' AND panel_status='1' ORDER BY panel_order");
        if (dbrows($p_res)) {
            while ($p_data = dbarray($p_res)) {
                if (checkgroup($p_data['panel_access'])) {
                    if ($p_data['panel_type'] == "file") {
                        $panel_name = $p_data['panel_filename'];
                        include INFUSIONS.$panel_name."/".$panel_name.".php";
                    } else {
                        eval(stripslashes($p_data['panel_content']));
                    }
                    $plc++;
                }
            }
        }
    }
}else{
    require_once ADMIN."navigation.php";
}