Demon invasion.

After the battle with Vittorio, and after defeating him, the game crashes with an error. I'm playing as a hero and recorded a short walkthrough on YouTube. The name of the error event is: APPCRASH. It happens when I start moving the main hero from the castle, and after skipping a turn, the game crashes. Sometimes it doesn't crash if the main hero doesn't leave the castle. It's a real mess. The crashes started happening constantly after killing Vittorio. It's impossible to continue playing.