Issue occurs during the quest https://en.uesp.net/wiki/Tamriel_Rebuilt:Hyperbolic_Tesselation in dialogue with Nelos Llothri where you have to convince him to rejoin the Mages Guild. If you choose the option "I see no reason why you could not still serve the Temple while working with Ethalvora in Andothren." and you succesfully convince Nelos, there's a %PCName variable missing from the sentence "I suppose you speak wisdom, ".