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', 'n0s82slotpv9nslbd14jqce170', '3.227.2.109', '1571504766', '1571504766', '/shop/index.php?cat=c9_Zubehoer.html')

[XT SQL Error]