1366 - Incorrect integer value: '' for column `mapshopatlogis`.`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', '7fea211f05aa6bf3b73e4ae9ae691e24', '3.235.228.219', '1656406244', '1656406244', '/index.php/cat/c19_Reliefkarten-Digital.html?refID=1')

[XT SQL Error]