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', 'ad3a0e2751449e617c30aa953d69952b', '3.141.35.60', '1713531474', '1713531474', '/shop_content.php/coID/2')

[XT SQL Error]