my oponent's time ran out and it's stalemate???

i've resently played a lot of bullet and i got some weird things happening...my oponent's time ran out and it said stalemate.why is that happening? pls help me with this thing____thanks, Yasen

I am pretty sure that is because when your opponent’s time ran out you did not have enough material to checkmate him

well maybe u double king each time. never take the last pawn`rook.. out well ur opponent is time out

I guess this is the game:


Already explained by #2. For more information:
lichess.org/faq#timeout