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', '0pn78qago3luol0c3087n8cum4', '18.116.26.90', '1746764492', '1746764492', '/xtshop/shop_content.php?coID=2')

[XT SQL Error]