"That player is not in the same house as you"

[Yvain]

I don't know why this happens, I sometimes get this message error when I try to invite someone which is, strangely, in the same house as me. Maybe a problem due to several players with the same name ? The aforesaid player can invite me though.
Does anyone know something about this bug ?

Edit : There is a similar topic in "house problem" part, but from 2012. Time to fix it, (or time to say that it's not going to be fixed^^)