Bugfix play_helper.py _forfeiting()

play_helper.py

@@ -660,6 +660,8 @@ def start_new_game(game_name, level, session_state_component, is_solved_componen
             gr.Info("Sad to see you go... Wrapping things up...")
             cur_game.finish_stats_(forfeit=True)
             if level in LEVELS and level not in _solved_games[game_name]:
+                if isinstance(_solved_games[game_name], str):
+                    _solved_games[game_name] = []
                 _solved_games[game_name].append(level)
             upload_to_drive(fp_out, update=True)
             return 0, _solved_games