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', 'b2497fd0799b53b448e6713b389c3cde', '3.236.138.35', '1674863767', '1674863767', '/product_info.php/info/p439_Reliefkarten-Konfigurator.html?refID=1')

[XT SQL Error]