Hello,
Available solutions :
1. Load backup saved file : [Esc] Pause Popup > Select Backup Load
2. Send the save files over to me for fixing : Tap F11 while in story mode (at the issue point) > copy the generated bug report (from the game’s folder) and email it to me
3. Use a completed game's save file +Theater mode , however you'll lose any of your personal achivements
Also, i would appreciate a detailed description of how this happened ? (in order to reproduce the bug and fix it for future)