1366 - Incorrect integer value: '' for column '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', '7196b3e21378755908c65336f9251ebd', '34.229.24.100', '1563484773', '1563484773', '/shop_content.php/coID/11/content/Widerrufsrecht')

[XT SQL Error]