1366 - Incorrect integer value: '' for column `hundgesund`.`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', 'a681bf2a2c588e8fce810c0ddc7313ed', '3.233.221.149', '1582242558', '1582242558', '/shop/shop_content.php?coID=4')

[XT SQL Error]