LogScript problem

Hello There!

I have two question about this topic. I have a very annoying issue. I use a package frome marketplace as my project base. I recreate a very lot think and extend with my own codes. But I have a problem with the original pack. I got a spam from terminal whit this LogScript:

LogScript: Warning: Script Msg: Attempted to access index -1 from array 'Weapons' of length 1 in '/Game/AdvancedPuzzleConstructor/BluePrints/Core/APC_Controller.APC_Controller_C'!

So the first question is that: how can I figure it out what is the problem realy is? I know the weapon array is the problem, but I do not know how to solve this.

Second question. I have strange performance issue on this project. Logging spam can cause performance drop in the editor?

Thank you very much for any reply!

Cheers.