'.$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', '9b78f7f04445cff1ceb9cd9841ab77bc', '44.200.171.74', '1660713473', '1660713473', '/rubikmazeshop/')

[XT SQL Error]