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', 'sqa86bl1drr05hk3tuu8cm2vb3', '3.145.197.164', '1746764027', '1746764027', '/xtshop/popup_content.php?coID=1')

[XT SQL Error]