1366 - Incorrect integer value: '' for column `creatihu_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', 'b2a1109d93147874b4534df8be36fb5f', '18.221.187.121', '1713535260', '1713535260', '/index.php?cat=c7_Pr--sentationssysteme.html')

[XT SQL Error]