'.$link_content.''; return $out; } ?>1366 - Incorrect integer value: '' for column `rubikmazeshop`.`whos_online`.`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', 'a1f6cd6a8dd00d73080120381bc07df7', '3.238.202.76', '1679331023', '1679331023', '/rubikmazeshop/')

[XT SQL Error]