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', 'dbb8fb27c5fc7f31bcc1d70d97dab962', '3.235.120.24', '1711693306', '1711693306', '/shop_content.php/coID/3')

[XT SQL Error]