Bug/Issue Black Screened/Game Closes

I'm a bit stuck on my single-player world, recently married Sebastian and had baby, had hubby's bday went through normal farm routine and then at the end of the day around 10pm-ish went to bed. Witch cut scene starts she flies over farm, hovers round chicken coop then flies off with her witch laugh, screen then goes black and game closes. Would love and appreciate any help that anyone could offer.