I made a site in php and when i visit it it shows a session id in the url.
http://pandhuishaaglanden.nl/wat_wij_verkopen.php?PHPSESSID=f4d91f171d85b4ccabbb8d06e29b7308
I dont know why or how, because google sees this a duplicate content in the SEO standaards.
Can someone please tell me what or how this is.