Hello :~Paramore~:, I'd recommend trying what Whisper quoted, however, if that does not work, try looking in Feralheart\media\particles for any doubles; they will be displayed as "_0, _1," and so on. Make sure you delete those, and then restart your game. If it still crashes, you could always redownload the game from this site.
Have you recently downloaded any mods, maps, etc? Sometimes those cause the game to crash.