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', 'b0309a3de7ca5a8c38b7c2805bc740c4', '216.73.216.121', '1751590967', '1751590967', '/index.php/cat/c19_Reliefkarten-Digital.html')

[XT SQL Error]