Equipment Upgrade System by Charlie Fleed, Version 1.2

[Charlie Fleed]

Maybe this is caused by some conflict with the ABS. It looks like there are weapons that are created at run time, like enhanced weapons are, but they're not enhanced weapons.
An easy way to fix that could be to add

Code:

and $data_weapons[i].is_a?(Enhanced_Weapon)

at the end of line 656. Try this. But I warn you that I didn't figure out the origin of the problem, you could have other errors.