Error: Lost connection to MySQL server during query

SELECT t1.*, `t1`.`comments_active` `comments`, t44.`path` path, t4.`crossed` crossed FROM `dir_links` t1 LEFT JOIN `dir_link_categories` t4 ON t1.`id` = t4.`id_link` AND t4.`crossed` = '0' LEFT JOIN `dir_categories` t44 ON t44.`id` = t4.`id_category` WHERE ((CONCAT(`t1`.`url`,' ',`t1`.`title`,' ',`t1`.`description`) LIKE '%problems%') ) AND `t1`.`status` = 'active'AND t44.`status` = 'active' GROUP BY t1.`id` ORDER BY `date` DESC LIMIT 0, 30