1366 - Incorrect integer value: '' for column `dbbgz2tq`.`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', '91bc79e2aebf6baee204533e1b48d2966de938ec', '34.231.21.83', '1591431780', '1591431780', '/product_info.php?info=p1239_College---Varsity-Jacke---rot-weiss.html')

[XT SQL Error]