Cannot call a function from another class! No errors UE4 just closes itself

Development Programming & Scripting C++
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14

I just updated my code in the question and yes it is a pointer.
But what I found out now is that ApplyDamage() wasnt the reason for my Crash.

The reason are these two lines:

AEnemyActor EActorObject;
	AEnemyActor *EActor = &EActorObject;

I commented them out and my code worked fine.
Now I dont know, if I have to define EActorObject somewhere else?