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', '64ee76982d3ac756433a9ec56c0b78e5', '18.212.102.174', '1711650624', '1711650624', '/redirect.php?action=product&id=55')

[XT SQL Error]