Crashing when attempting to use .Add() on a header TArray?

I posted this:

Why does attempting to .Add() something to a TArray crash the editor? : unrealengine (reddit.com)

currently no luck… So I’m basically cross posting it here.

It can print the tile locations without issue, and add them to a TArray that is created inside the function. So I figure that it seems to have trouble accessing the TArray in the header specifically.

Any idea what I’m doing wrong? I can provide more information if needed.