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', 'rmc7i2s31l6atrikm2lhkq6md2', '3.146.105.72', '1738993750', '1738993750', '/index.php?XTCsid=3urkhm9sdqaa68rq8ocuqac7t6&cat=c22_Funktelefon-Akku.html')

[XT SQL Error]