Yes, the third person template available in the UE4 launcher has a good example. If you open its Anim BP, you’ll find that its calling the “IsFalling” function in the main graph and storing its value into a custom bool variable “IsInAir?”
And since its calling an IsValid check before doing so, chances are you’re not going to get those Accessed None errors.
You can then go on and use the “IsInAir?” variable while evaluating the animation state transitions.
