Thanks in advance
Was the site working with a previous version of Adobe Muse? Are you using any third party widgets in your site?
Where are you using the Facebook link?
I don't know if before I had this problem but I don't think so. I have this problem only when I'm writing in the adress bar the website with an anchor like this www.luvax.de/#medizin
I use to put this kind of links with the anchors when I'm posting something on Facebook.
What do you mean third party widget? You mean extern widget ? Because I used only the basic Muse widget.
It's working! I just update the all website with the new Muse CC 2018 and the message is gone.