stack overflow when the A.I has no available moves

[HermesPasser]

👀
Cortesia de @BrunoVRoger

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File "/home/bcr/Documentos/personal/chessia/ui/worker.py", line 42, in run_ai
    from_pos, to = self.game.play_turn_ia_start()
  File "/home/bcr/Documentos/personal/chessia/engine/game.py", line 305, in play_turn_ia_start
    _, ai_move = ai.calc_best_move(self.ai_difficulty, self, Color.BLACK)
  File "/home/bcr/Documentos/personal/chessia/engine/ai.py", line 72, in calc_best_move
    value = calc_best_move(depth - 1, game, player_color, alpha, beta, not is_maximizing_player)[0]
  File "/home/bcr/Documentos/personal/chessia/engine/ai.py", line 94, in calc_best_move
    return [best_move_value, best_move or possible_moves[0]]
IndexError: list index out of range