1366 - Incorrect integer value: '' for column `mapshopatlogis`.`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', '80810ed0a10fd89c510c09a39998dc51', '216.73.216.108', '1763458728', '1763458728', '/index.php/cat/c19_Reliefkarten-Digital.html?refID=2')

[XT SQL Error]