SQL: Select `SeriesGroup`.* From `SeriesGroup` where (url_segment_en='tubular') and (category_id=) and (status=0) limit 1

Message: SQLSTATE[42000]: Syntax error or access violation: 1064 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 ') and (status=0) limit 1' at line 1

Fatal error: Call to a member function fetchAll() on null in /var/www/clients/client3/web31/web/system/class/DList.class.php on line 11