Error removing a poll from thread

I was testing out polls via editing the first post of my thread, and now I can’t remove it.
If I try deleting it I get:

Here’s the thread. For the time being I hid it in a “Hide details” box.

Maybe polls are not removable at all? Would be good to know when creating them. :smiley:
Thanks for help…

Strange, I just tried and could delete it without a problem. Not sure why this would have happened.

Ok, well, thanks a lot anyways… :slight_smile: