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', 'cr7nletpq4m2e3h8jfa3ocpug2', '18.97.14.82', '1747095282', '1747095282', '/xtshop/product_info.php?info=p372_.html')

[XT SQL Error]