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', '45961256f4657cc7fae16af44449eaec', '18.221.187.121', '1713498281', '1713498281', '/product_info.php?info=p247_Nessun-Dorma.html&XTCsid=a30b88a4b439ebf54b931b21d14e2df9')

[XT SQL Error]