Instructors page not working

New update has broken the instructor page and throws an SQL error. Instructors listed as “approved” no longer appear.

Had to change plugin code to:

if($course_filter == 'approved'){
			$course_filter = " AND inst_status.meta_value = 'approved' ";

		} else {
			$course_filter = $course_filter != '' ? " AND inst_status.meta_key = '_tutor_instructor_course_id' AND inst_status.meta_value = '".$course_filter."' " : '' ;
		}