Error!

MySQL Error: Incorrect integer value: '' for column 'ref_id' at row 1
SQL Statement: INSERT INTO user_tracking_current_8 (object_type,object_id,req_url,http_referer,accessed_on,user_id,ref_type,ref_id,user_ip,user_agent) VALUES ('content','324304','/contents/view_videos/2019-10-14/tokiwa-cosmetics-america-offers-full-turnkey-us-factory/','','2022-01-17 04:27:34',-1,'','','54.175.165.101','CCBot/2.0 (https://commoncrawl.org/faq/)')