diff -r 7bfe0d739b1c -r 0cafbe17c0aa plugins/groupchat.lua
--- a/plugins/groupchat.lua	Thu Jun 24 17:51:36 2010 +0100
+++ b/plugins/groupchat.lua	Mon Jul 26 11:34:13 2010 +0100
@@ -72,7 +72,7 @@
 		self.rooms[jid] = room;
 		local occupants = room.occupants;
 		room:hook("presence", function (presence)
-			local nick = presence.nick;
+			local nick = presence.nick or nick;
 			if not occupants[nick] and presence.stanza.attr.type ~= "unavailable" then
 				occupants[nick] = {
 					nick = nick;