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', 'k1u70hhfv1ra94g6gc76vgbq13', '3.227.2.109', '1571508879', '1571508879', '/shop/index.php?cat=c16_Aktionen.html')

[XT SQL Error]