I'm not a Mac user so I chose the PC version.
I'm sorry for the inconvenience ;__;
Did a bit of research, it's apparently due to a save file malfunctioning. What happens if you load a previous one and go through the scene?
If it doesn't work please tell me which choices you did \ how many medals you have, so I can make a savefile past that scene and send it to you... I'm sorry, it's the first time ever that this particular error occurs ;w;