(SOLVED) How do i stop my game crashing when teleporting the nearest entity to it?

So for my custom entity it has two hitboxes, one for its helmet and its body. And for the helmet hitbox I made it another entity that constantly teleports to the main entity so the hitbox stays still and consistent. And it works fine but when I spawn the custom entity on the same block the game crashes, I get why this happens because its trying to find the nearest entity but is there any alternative way to get the same function without crashing the game when they are close to eachother?