See screenshot attached.

My site is also having the same issue.

Going to open a ticket.

You should contact avast in this case and alert them of the false positive. 

9 hours ago, Rhett said:

You should contact avast in this case and alert them of the false positive. 

I have the same issue on one of my sites. I don't use avast - but the users have. I reported my site on https://www.avast.com/report-a-url.php

Could we see anything from the picture what is causing it?

 

EDIT - got the following mail from avast: 

Hello,

 

Thank you for contacting Avast, although we wish it were under better circumstances.

 

This was a false positive detection. Our virus specialists have been working on this problem and it has now been fixed. It may be necessary to restart web browser in order to apply this fix.

Thanks @Kjell Iver Johansen

 

Same thing started all of my problems too!