GetItemProp range_error min:0

Hello Ragezoner's today i have added the weapon leveling system in to the source.

Compiled it just fine.
But when you are in game and you are gonna view someone you get the error

GetItemProp range_error min:0, max:401581, index:1635888

At first i thought well it must be something i had defined to high.
But not both of the numbers or not in the defineItem/Obj/Neuz/.

So i disabled the weapon lvling and no more error.

Can someone explain it to me where to look the solve this one.
Cause it will dc an player and the user will have an error log at the same size as his HDD. :D