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', '0bm086pbtgca608o7lf5q6j4m0', '216.73.216.141', '1751427678', '1751427678', '/product_info.php?info=p9_Paper-Lantern.html&XTCsid=33509f1bee4ee2cbb673a74e5faae0d4')

[XT SQL Error]