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', '9bo1n2k7usae2k3bihbjus1ec3', '3.145.8.49', '1738998397', '1738998397', '/index.php?XTCsid=nj57khd41hu8ciniagj0kmvlc3&cat=c1084_Fromm-Werkzeug-Akku.html')

[XT SQL Error]