Crashed with this error:
"Script 'Window_PregnancyData' line 37: TypeError occurred.
can't convert nil into String"
Super precise reproduction steps: Save edited myself some sex swap potions, used one on my default human male at the start of the game (he had a good Mother trait), bred her with the dwarf male to create a half-dwarf offspring, took this half-dwarf and bred her in the brothel with a full dwarf male until she got pregnant, checked the pregnancy window on her stat window.
From the second half onward the crash occurred consistently across multiple attempts. While the crash occurred on 0.3.02, the save was started in 0.300
Edit: Experienced a random crash while spamming brothel sex
Edit2: The other details don't seem to matter: Checking the pregnancy window for a character that got pregnant in the brothel always causes a crash