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', 'tignu7v5bdkksbpkv7u73jl140', '18.116.61.213', '1746938745', '1746938745', '/product_info.php?info=p640_806361-Heizstab-fuer-Edelstahl-Bruehkessel--6-kW.html')

[XT SQL Error]