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', '5199f70f8160a49ffabee8fe93168cf5', '13.58.216.18', '1714115581', '1714115581', '/redirect.php?action=product&id=50')

[XT SQL Error]