1366 - Incorrect integer value: '' for column `hbl_shop`.`whos_online`.`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', 'fjd7hnsthofbfc2u0tcv0fh9j3', '3.139.64.42', '1746940764', '1746940764', '/product_info.php?info=p653_806422-Schlachtekessel--Bruehkessel--Kochkessel-100-Liter.html')

[XT SQL Error]