Create a supply box, filled with a bunch of items (for my example, I had 20 of each working weapon, 20 of each working backpack, 20 of each working clothes, and 50 of each ammo). Simply drag one weapon out of the box into your primary weapon slot (if empty). Then try to replace your current weapon by dragging another weapon onto the primary weapon slot (already with weapon filling slot). Game crashes. No mods currently used.