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', '15g5tom12d8dc1dpf32635hfr0', '3.85.143.239', '1558355610', '1558355610', '/shop/shop_content.php?coID=4')

[XT SQL Error]