1366 - Incorrect integer value: '' for column `hundgesund`.`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', 'c669460c05fd5d5fb160194c65e548bc', '3.233.221.149', '1582238758', '1582238758', '/shop/index.php?cat=c7_Spielen.html')

[XT SQL Error]