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', '1945bfc6405c8a75aa9a81a1eecd589f', '216.73.216.48', '1761971093', '1761971093', '/index.php/language/de/refID/1')

[XT SQL Error]