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', '12d2e0bfd84a54175f34e29df36b30ca', '216.73.216.121', '1751966735', '1751966735', '/index.php/cat/c8_Reliefkarten-Poster.html')

[XT SQL Error]