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', 'qi4h0b87k36bj6jm67lvteajs6', '18.119.29.162', '1746967559', '1746967559', '/xtshop/product_info.php?info=p879_.html')

[XT SQL Error]