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', 'o3tmram7ukkj1p816kgcsfe6h4', '3.137.215.122', '1738998318', '1738998318', '/index.php?XTCsid=mkl8qqqorbnshicuaf45rnrdo2&cat=c722_Funk-Kopfh--rer-Akku.html')

[XT SQL Error]