LibLoad problem

So I am making a game with lots of levels. Each of these levels need to have a pause menu. So instead of appending and setting up the same scene (for each and every level), I started to experiment with LibLoad instead.

The problem:
After loading (LibLoad) and clearing (LibFree) around 7 times, causes blender to crash.
Is this because I am not giving the program enough time to “free” or “load” the contents of the .blend?

Here is the script I am using:

import bge

cont = bge.logic.getCurrentController()
own = cont.owner

path = bge.logic.expandPath("//demo_file.blend")

load = cont.sensors['load']
clear = cont.sensors['clear']

if load.positive:
    bge.logic.LibLoad(path, 'Scene')

if clear.positive:

The python controller is connected to keyboard sensors with TAP selected.

Is there a better solution to add a pause menu? (it will most likely be an overlay).