1366 - Incorrect integer value: '' for column `dbkh8z2q`.`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', 'e3ee21097762996ac778e95444758993d07bea2d', '3.231.226.13', '1591471306', '1591471306', '/eshop/index.php?cat=c7_Aufkleber.html&XTCsid=4ac38b9e9e64c1af6173e1cd3ca923d9')

[XT SQL Error]