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', 'a90c2c866971d456c65939ebf765e2ae', '216.73.216.134', '1769656897', '1769656897', '/index.php/language/en/refID/1/cat/c19_Reliefkarten-Digital.html')

[XT SQL Error]