threat has been detected htpp:af.opera.com/api/queri?client=opera

I dont have Opera installed but for the last 2 days I frequently get threat message: threat has been detected htpp:af.opera.com/api/queri?client=opera

Why and what is the problem?? :-[ :cry:

Please (re)search before posting.
There is no need to open a new thread if there is already one about the same problem/subject.

https://forum.avast.com/index.php?topic=197572.0;topicseen