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', '5acde6bf5ecdec7947ed42de49d77d9c', '216.73.216.201', '1752832341', '1752832341', '/index.php/language/de/cat/templates/css_dark_green/img/pixel_trans.gif')

[XT SQL Error]