1366 - Incorrect integer value: '' for column `agentur`.`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', '1iqencn4kn1mvvv66anvhu90o2', '3.235.101.50', '1601421426', '1601421426', '/product_info.php?info=p24439_Let--180-s-Dance-mit-Paul-Janke-16.html&XTCsid=l56nbturorq4sho45n10a33330')

[XT SQL Error]