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', '56i9qaic21hqtqcpr23fri2sn7', '216.73.216.47', '1757725430', '1757725430', '/product_info.php?info=p511_Energetische-Mischung-ohne-Huelsenfruechte-25kg-E.html')

[XT SQL Error]