I got the same thing. I think the trigger is a cultist encounter. The fight, whenever I come across it, never plays properly, and I'm suddenly in a new area or the game skipped a step in the investigation afterwards. Sometimes I'll just be in a new random event. When this encounter is the first event, no matter what case I'm doing, it also tries to play the mermaid case ending and the two suddenly overlap and the crash report pops up.