Why is this a draw?

https://www.littlegolem.net/jsp/game/game.jsp?gid=2437405&nmove=19

I analyzed the game from start to finish a couple of times, and I don't get the outcome.

The only reason I can think of is, it is a draw by agreement. Did your opponent send a draw by agreement request, and you accepted it?

I may have accepted the request but I don't remember.