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', 'ti0v96ip70vgucc4lro59g6v02', '18.189.180.234', '1738999327', '1738999327', '/index.php?XTCsid=nj57khd41hu8ciniagj0kmvlc3&cat=c1178_Einhell-Werkzeug-Akku.html')

[XT SQL Error]