Error!

MySQL Error: Incorrect integer value: '' for column 'ref_id' at row 1
SQL Statement: INSERT INTO user_tracking_current_5 (object_type,object_id,req_url,http_referer,accessed_on,user_id,ref_type,ref_id,user_ip,user_agent) VALUES ('content','325350','/contents/view_videos/2019-10-30/scenes-from-metalcon-2019/','','2022-01-23 03:29:24',-1,'','','3.85.80.239','CCBot/2.0 (https://commoncrawl.org/faq/)')