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', '4a94f041df39847a865cf387139c0922', '216.73.216.44', '1768719261', '1768719261', '/index.php/cat/c37_Welt.html')

[XT SQL Error]