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', 'cft3ig4id1cr7ann90lte14ok5', '216.73.216.118', '1761422572', '1761422572', '/shop_content.php?XTCsid=2fab07f7a09b13e4ee5c8e548c6bf380&coID=8')

[XT SQL Error]