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', 'g3q262i2g4pf2ojfpva9tj6im5', '216.73.216.141', '1751423193', '1751423193', '/product_info.php?info=p9_Paper-Lantern.html&XTCsid=7c604026da355cfd6a094c68b431572d')

[XT SQL Error]