Game aborted

I was playing in following tournament: en.lichess.org/tournament/3kPpx0FO
When I was almost sure of winning the game: en.lichess.org/8jGBBjHs (I have only 11 seconds left, but still this time should be enough to win it) I get following message: "Game aborted" and nothing then - I was not able to complete the game, nor to view analysis of it. Any idea what's happening and have anyone else experienced such an issue?

Thanks in advance :)

The person you played against was flagged as using computer assistance, so he could no longer compete.