'.$link_content.''; return $out; } ?>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', 'ba9833188cf23c2b4fdf41dc391941b1', '3.234.211.61', '1634614030', '1634614030', '/rubikmazeshop/')

[XT SQL Error]