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', 'ca7f247d36b25a8d3a5702bfd23a63a1', '216.73.216.191', '1758171079', '1758171079', '/index.php/language/en/cat/c8_Reliefkarten-Poster.html')

[XT SQL Error]