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', '378f15dbe20569c50886b4223c4b1b48', '44.222.90.25', '1711713788', '1711713788', '/index.php?cat=c_.html')

[XT SQL Error]