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', '94a5924df8b382f18796cabba5d888ab', '216.73.216.109', '1765830046', '1765830046', '/index.php/cat/c44_3D-Karten.html?refID=2')

[XT SQL Error]