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', 'f727ceb9306089aa8350ba823c28ad1d', '52.14.126.74', '1715202989', '1715202989', '/shop_content.php/coID/7')

[XT SQL Error]