1366 - Incorrect integer value: '' for column `hbl_shop`.`whos_online`.`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', 'hre5086i8tjj5r8bdk4f9m7t72', '18.97.14.91', '1763397722', '1763397722', '/product_info.php?info=p600_806095-Obstmuehle.html')

[XT SQL Error]