OnActorHit is firing when enemy hits wall

Hello UE4 Community, (sorry for my english)
I have a problem with my enemy AI. There is a trigger box which triggers the enemy to move to the actor. This works fine. I have set that when he hits me (OnActorHit) the level reloads. But the level actually reloads when I (for example) turn left and the enemy hits the wall when he is turning left too. How can I avoid that? The level reloads not only when the enemy hits me, also everything else.

I hope i’ll get an fast answer!

Daniel