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', 'h656nojr4nc97rnqd3e081ru43', '18.218.72.220', '1738999559', '1738999559', '/index.php?XTCsid=nj57khd41hu8ciniagj0kmvlc3&cat=c159_Bosch-Werkzeug-Akku.html')

[XT SQL Error]