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', '90g210mdgt9850svv1lem8udb7', '3.144.235.50', '1746770793', '1746770793', '/index.php?cat=c4_Gefluegelzuchtbedarf.html')

[XT SQL Error]