1366 - Incorrect integer value: '' for column 'customer_id' at row 1

insert into whos_online (customer_id, full_name, session_id, ip_address, time_entry, time_last_click, last_page_url) values ('', 'Guest', 'kv54nsc04qm10gpfs6mvfbs8n0', '3.139.83.202', '1746765253', '1746765253', '/xtshop/shop_content.php?coID=1')

[XT SQL Error]