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', '2a41c646fa49c1939387baa83eb0e2e3', '34.228.239.171', '1711695438', '1711695438', '/redirect.php?action=product&id=7')

[XT SQL Error]