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', '351e1e9367bb1beecb89dc27f76a6258', '18.226.150.175', '1713955682', '1713955682', '/product_info.php/info/p64_MET-Honigwein-0-75-l-lieblich.html')

[XT SQL Error]