1366 - Incorrect integer value: '' for column `mapshopatlogis`.`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', '2435314a8391b84e051a5ba5f957bb63', '18.221.187.121', '1713487410', '1713487410', '/shopping_cart.php/language/de')

[XT SQL Error]