Nope. Caused by ground effects.
Try to figure out which ADT is giving you this WoW Error. Then go to noggit and paint over ADT with pressure 0,1 4 different textures (that means, that every chunk of that ADT will have all 4 textures used). It might by a bit annoying that you will have to swap those textures with texture swapper whenever you will want to paint something else, new, visible there, but it will at least solve your error.
Whenever you edit ADT with already applied ground effects in noggit, this can happen. Error means that client was trying to apply ground effect with ID 0 on some chunk, but that ground effect doesn't exist -> crash. So, if you don't want to have this again, simply always apply 4 textures everywhere or apply ground effects when you are completely finished with that location and don't want to work with that ADT in noggit anymore.
EDIT: Btw, I saw this error somewhere in FAQ/known WoW errors or something like that.