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', '371230366f9d01bb5079136c7b589c61', '18.204.56.185', '1659975794', '1659975794', '/index.php/cat/c19_Reliefkarten-Digital.html?refID=2')

[XT SQL Error]