1366 - Incorrect integer value: '' for column `CP_as15`.`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', 'tm9d5c71a53rvrr6i4brnl97i1', '3.139.85.51', '1738995675', '1738995675', '/index.php?XTCsid=3urkhm9sdqaa68rq8ocuqac7t6&cat=c1236_Babyphone-Akku.html')

[XT SQL Error]