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', 'rq4mgqa1lcjqtls52190ubsnk0', '34.238.189.171', '1566450067', '1566450067', '/shop/product_info.php?info=p17_Netzteil-12V--stabilisiert---1-5A-fuer-Ueberwachungskameras.html')

[XT SQL Error]