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', '187ffc4570340ee85ace9b2e4d3912d3', '18.227.105.83', '1722063493', '1722063493', '/shop_content.php/coID/4')

[XT SQL Error]