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', 'a0a0ausqbofmohm88nhv6pghs0', '3.16.78.90', '1738998896', '1738998896', '/index.php?XTCsid=nmu1l7bj1113ksvu525rsptc72&cat=c213_Paslode-Werkzeug-Akku.html')

[XT SQL Error]