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', 's5gp2glvamgooj1tqkl4oi72a7', '18.222.183.98', '1746981809', '1746981809', '/xtshop/product_info.php?info=p998_.html')

[XT SQL Error]