Why is this a draw?

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milkovich

I had 20 seconds left to get a quen and mate the opponent, I think this is an error because the game ended in a draw because of a repetition. 

Lagomorph

No repetition. You stalemated your opponent.... draw

 

https://www.chess.com/live/game/2391493596?username=milkovich

milkovich

Haha, I see know.