Avast Web shield blocks Whatsapp QR-code from loading

Since a few days the QR-code of Whatsapp is not loading on Firefox, instead a circle keeps turning. A search on the internet showed that people using an other virusscanner where able to solve the problem by making an https acception in there Virusscanner. So to see if Avast web shield was blocking the loading of the QR-code I turned off web shield temorarily, resatted FF and the QR-code loaded. Disabeling web shield is not a good idea. Is there a way to solve this problem without disabeling web shield?
Or can this be changed within e new Avast release?

You can report a suspected FP (File/Website) here: https://www.avast.com/false-positive-file-form.php