I've just updated the game with a few bug fixes, you should be able to open the menu without it freezing when you have Eduard with you now! Just download the new update and here's how to transfer your save file to the new version:
Go to the "www" folder included in the game folder. In the "www" folder should be another folder called "save".
Now just copy that folder and paste it into the "www" folder of the updated version.