Error: Lost connection to MySQL server during query

SELECT t1.*, IF (t1.`id_editor` > 0, t2.`username`, t1.`author`) author FROM `dir_link_comments` t1 LEFT JOIN `dir_editors` t2 ON t1.`id_editor` = t2.`id` WHERE t1.`id_link` = '5259' AND t1.`status` = 'active'