Hm, you should post the whole code, but I guess it picks unit from udg_castervars ( Its a global GUI array, probably unit array ) returns its handle id.
I found it in JASSCraft under CasterSystem.j that's why I first mistook it for a native. I just figured out that it cant help me so thanks for that help anyway. :shades:
Ghan has said he has fixed this. Monovertex please confirm this fix. This was only a problem with people that had signatures in the upper levels like not the special members but the respected members.