You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'ORDER BY f.ordernumber' at line 5

SELECT f.id,f.title
                                FROM bbs_inforums AS i
                                LEFT JOIN forum_forums AS f
                                ON i.forum_id = f.id
                                WHERE i.thread_id =  ORDER BY f.ordernumber