UE4 pathfinding without turning around as in Pacman

I am making a 3D Pacman Game using Blueprints and the UE4 standard NavMesh pathfinding algorithm. It works all fine, but I can't get the pathfinding to prevent 180 degree turns. In Pacman, the ghosts can't directly turn around and have to find another path instead. Does anyone have an idea how to achieve this? (im a complete path finding Noob)