I'm having the same issue. They recently expanded polls from 25 total to 50. This is when the problem started. I'm guessing there is some development issue causing this problem. Hopefully, they patch this soon.
This happened to me on a zoom meeting last night. As host, I created two poll questions just prior to start of the meeting. I normally have polls pre-loaded but had a last minute presenter decision. First poll question launched, displayed results and closed fine. Error message appeared when I attempted to launch the second poll.