1366 - Incorrect integer value: '' for column `pella-ware`.`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', 'd971e8940122bd7f8182b54776732449', '3.14.253.221', '1714133303', '1714133303', '/newsletter.php')

[XT SQL Error]