1366 - Incorrect integer value: '' for column `meersalz_2017`.`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', '5qeg2g8jeph4go4d0nkpt0naf1', '3.236.98.25', '1593693348', '1593693348', '/product_info.php?products_id=1005')

[XT SQL Error]