Accessed None when I try press key to interact with NPC

Hello, that is my first visit here so I wanna to say hello to everyone.
I’ll try make that’s thing I (user) press “E” next to NPC it will reduced player health to 0. It’s work but its 50% chance to work.
There are ss:
Box and InterVolume are overlapping areas.

The problem with your blueprint is, that the event OnComponentBeginOverlap(InterVolume) will only fire the moment the overlap begins.

What you want is to do check if you hit the key, if a Merchant is overlapping with your Inter Volume.
You can do that by calling GetOverlappingActors.

Thank you very much!