I can see the following message in question : "This question was closed 16 hours ago by Roman Koryakov for the following reason: The question is answered, right answer was accepted"
Here you can find the link to the question:
I created some screenshots as well:
My problem that right answer was not selected.
I think it would be useful if the system verify somehow whether an answer was accepted or not before close a question.
I'm not sure whether it is a bug or a feature request but I think we should deal with this topic.
Thank you and best regards,