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', 'jmrshh7anv0c97bdbeh1pshss2', '216.73.216.80', '1751317625', '1751317625', '/product_info.php?info=p12_33-feet-crape-paper.html&XTCsid=85f438a686cbfb5e3ea5e5d6b9611958')

[XT SQL Error]