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', '011b0e7138b66a9e2cf8139c7aa42ffa', '216.73.216.108', '1763377485', '1763377485', '/index.php/cat/c19_Reliefkarten-Digital.html?refID=1')

[XT SQL Error]