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', 'ab4a961e4bf6bd9731120b9ab1f88eb3', '35.168.113.248', '1711725127', '1711725127', '/product_info.php/info/p49_API-Propolis-Balsam-50-ml.html')

[XT SQL Error]