1366 - Incorrect integer value: '' for column `shop_db3`.`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', '3166a976ac6ff3564f35c965b687fb11', '18.221.13.173', '1714121381', '1714121381', '/product_info.php?info=p247_Nessun-Dorma.html&XTCsid=887fff7384999e8c958f14224ebe6b7c')

[XT SQL Error]