Ошибка после обновления mysql

Добрый день! После обновления mysql при авторизации на сайте выдает ошибку:

Вероятно что-то изменилось в синтаксисе mysql, раньше он распознавал пустое значение в запросе для поля с типом integer как 0 или null, а сейчас выдаёт просто ошибку.

Помогите, пожалуйста, решить проблему.

Код файла login.php

<?php

//***************************************************************************//

//                                                                           //

//  Program Name    	: vCard PRO                                          //

//  Program Version     : 3.1 Build 4                                        //

//  Program Author      : Joao Kikuchi,  Belchior Foundry                    //

//  Home Page           : http://www.belchiorfoundry.com                     //

//  Supplied by         : WTN-WDYL Team                                      //

//  Nullified By        : WTN-WDYL Team                                      //

//  Distribution        : via WebForum, ForumRU and associated file dumps    //

//                                                                           //

//                (C) Copyright 2001-2005 Belchior Foundry                   //

//***************************************************************************//

define('IN_VCARD', true);

define('CURR_PAGE','login.php');

$templatesused = 'page_user_login';

include('./lib.inc.php');

//var_dump($user);

//exit();

if ($action == 'logout')

{

	$SESSION_site->logout();

	my_redirect_die(INDEX_PAGE);

}



if ($action == 'login')

{

	$is_logged = false;

	$user_email = strtolower($user_email);

	$sql = "SELECT * FROM ". TBL_USR_PROFILE ." AS u LEFT JOIN ". TBL_USR_GROUP ." AS g ON (u.usergroup_id=g.usergroup_id) WHERE u.user_email='". addslashes(trim($user_email)) ."' AND u.user_password='". md5(trim($user_password)) ."' ";

	//$sql = "SELECT u.id as user_id, u.name as user_name, u.email as user_email, u.ip_address as user_ip, g.* FROM forum_members AS u RIGHT JOIN ". TBL_USR_GROUP ." AS g ON (g.usergroup_id='2')  WHERE LOWER(email)='". addslashes($user_email) . "' AND password='". md5($user_password) ."' LIMIT 1 ";

	$SESSION_site = new Session_site($sql,'su');

	if($SESSION_site->is_logged())

	{

		$s = $SESSION_site->get_sid();

		$user = $SESSION_site->data;

		if ($user['user_active'] != 1)

		{

			usr_message_die(GENERAL_ERROR,$msg['error_mem_not_activation'],'back');

		}

		

		$SESSION_site->set_var('user',$fuser);

		$is_logged = true;

		if (empty($user['user_id']) )

		{

			$is_logged = false;

			$data = $DB_site->query_first($sql);

			if (!empty($data))

			{

				$SESSION_site->assign_sql_row_data($data);

			}

			unset($data);

			unset($sql);

		}

		// cat access

		$cat_access = array();

		////$sql = "SELECT * FROM ". TBL_CARDS_CAT_PERMISSION ." WHERE usergroup_id='". $user['usergroup_id'] ."' ";

		//$data_arr = $DB_site->query($sql);

		//while($row = $DB_site->fetch_array($data_arr))

		//{

		//	$cat_access[$row['cat_id']] = $row['cat_id'];

		//}

		//$DB_site->free_result($data_arr);

		//$SESSION_site->set_var('cat_access',$cat_access);

		//$SESSION_site->update();

		unset($cat_access, $data_arr);

		if (!empty($ref))

		{

			$url = urldecode($ref);

			$url = str_replace('|', '?', $url);

		}

		else

		{

			$url = INDEX_PAGE;

		}

		my_redirect_die($url);

	}

	else

	{

		$is_logged = false;

		usr_message_die(GENERAL_ERROR,$msg['error_mem_login_error'],'back');

	}

}

if (!empty($user['user_id']))

{

	my_redirect_die(INDEX_PAGE);

}



//eval("\$form_user_login = \"".get_template('form_user_login')."\";");



if ($action == 'modal'){

   eval("make_output(\"".get_template('form_user_login')."\");");

    exit();

}

include(VCARD_ROOT_PATH.'include/user_header.inc.php');

/* ################################### PAGE ############################## */

$url_ref = !empty($ref)? urlencode($ref) : urlencode(urldecode($url_ref));



eval("make_output(\"".get_template('page_user_login')."\");");

include(VCARD_ROOT_PATH.'include/user_footer.inc.php');

?>