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', 'badbdc58098678bc1c8af5a7b3da275f', '3.233.221.149', '1582246529', '1582246529', '/shop/product_info.php?info=p560_-Hunde-w--rden-l--nger-leben--wenn----.html')

[XT SQL Error]