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', 'kkgp7ehjppq3s4k685fs9dftg0', '18.215.161.19', '1560711697', '1560711697', '/shop/index.php?cat=c13_Halterungen.html')

[XT SQL Error]