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', '4c4f4167b9d3a445ceb6094c12d0b8a6', '3.133.144.197', '1714062120', '1714062120', '/product_info.php/info/p11_Lindenhonig.html')

[XT SQL Error]