Sorting users in backend make error

Unknown column 'e.' in 'on clause' SQL=SELECT COUNT( DISTINCT a.`id` ) FROM `bthsf_comprofiler` AS a INNER JOIN `bthsf_users` AS b ON b.`id` = a.`id` LEFT JOIN `bthsf_session` AS c ON c.`client_id` in (0,1) AND c.`userid` = a.`id` LEFT JOIN `bthsf_user_usergroup_map` AS d ON d.`user_id` = a.`id` INNER JOIN `bthsf_user_usergroup_map` AS e ON e.`` = a.`` LEFT JOIN`bthsf_user_usergroup_map` AS f ON f.`user_id`=e.`user_id` WHERE ( f.`group_id` = 13 )