1366 - Incorrect integer value: '' for column `sql12320`.`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', 'dd9538555a8dbca9e59de11cf042f524', '3.83.188.254', '1585990075', '1585990075', '/shop/ifshop_content.php/coID/7/content/Kontakt-zu-uns')

[XT SQL Error]