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', 'jou0lton19flrub8qact000o93', '52.14.244.213', '1746766198', '1746766198', '/xtshop/advanced_search.php')

[XT SQL Error]