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', 'eo8fjnvu44ljj4easq145hg4h5', '13.58.130.38', '1738998708', '1738998708', '/index.php?XTCsid=nj57khd41hu8ciniagj0kmvlc3&cat=c185_Makita-9-6Volt-Akku.html')

[XT SQL Error]