Accessed none for add to viewport after 4.9 update

THIS WORKED, turns out we were all experience this due to networking not sure about you guys but personally my set up was coming off a multicast. I’m making a TCG and when you play a card it shows a blown up version of the card with particle effects on both players screens “so the opposite player knows what is going on” but even though I knew I had the logic correct I persistently got this same error.

Adding a “Switch Has Authority” to choke my server off the multicast fixed the error, in hindsight I see the error in my ways, of course the server would have this problem since their is no view port TO add to as a server. The fact I was in a multicast logic totally slipped my mind, that was frustrating. Thanks for the fix!