1366 - Incorrect integer value: '' for column `argus_xtc`.`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', 'eu4akpbolupuggf5h9ntoe02v5', '18.215.161.19', '1560710424', '1560710424', '/shop/product_info.php?info=p357_Kabel-fuer-Ueberwachungskameras--RG59---2-x-0-75mm--305m.html')

[XT SQL Error]