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', 'v4te09nm6i91q6nhm4mfsa46b2', '3.84.182.112', '1555937549', '1555937549', '/messenger_bag_tote_bag_canvas_cover/shop_content.php/coID/4')

[XT SQL Error]