"failed to setup flash Jason.stringify cannot serialize cyclic structures "

I use Macs I get this message on several sites that until a few days ago worked fine.  "

failed to setup flash

Jason.stringify cannot serialize cyclic structures"

If I remove flash from my system they work fine  but as soon as I put it back I get this. On my other Mac computers with flash it all works fine together. I think its started when I loaded 20.235 ? What did they do and is there a fix. ?