Hi, I am working on a project and I found a weird issue that only happens in release build

I have a a function that returns a string

(Member is a string member I use quickly for this example but basically it happened with all my code)
and it works in the editor, the string is properly returned and I can work with it, but when I test it in a standalone build, the game crashes immediatly when the function is called
this is the log it generated when crashing

error.log