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', '2ff8344b8dafbf5c7abeaca9cd505f20', '34.239.151.124', '1719239128', '1719239128', '/index.php?refID=2')

[XT SQL Error]