ViperFang&DragonTailnpc help

Heyall,

i added a npc wich add viperfang & Dragontail. but when i talk to the npc and press on claim i get this error in my console
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I use version 5522.
The first account did claimed the skills but than i moved the npc from position(X,Y) and than i tried to claim it with my 2nd accound and then i got the error.
Does anyone know whats wrong?

Ty.

preakpoint the line it's talking about. Null reference exception means something is not initialized. It lists the line of code where the error happened so all you need to do is go there, breakpoint it, do the action again, check what element is null and then fix the cause behind the error.

Yay simple debugging!