CH14 AlphaGo Zero：ValueError: max() arg is an empty sequence

[Dirtyboy1029]

Traceback (most recent call last):
File "D:/Pycharm/Project/deep_learning_and_the_game_of_go-master/code/zero_test.py", line 87, in
main()
File "D:/Pycharm/Project/deep_learning_and_the_game_of_go-master/code/zero_test.py", line 69, in main
black_move = black_agent.select_move(game)
File "D:\Pycharm\Project\deep_learning_and_the_game_of_go-master\code\dlgo\zero\agent.py", line 102, in select_move
next_move = self.select_branch(node)
File "D:\Pycharm\Project\deep_learning_and_the_game_of_go-master\code\dlgo\zero\agent.py", line 150, in select_branch
return max(node.moves(), key=score_branch) # <1>
ValueError: max() arg is an empty sequence