diff -r 7921c8d671c8 -r db8de1b464d3 mcabber/mcabber/xmpp_muc.c
--- a/mcabber/mcabber/xmpp_muc.c	Tue May 14 22:19:33 2019 +0200
+++ b/mcabber/mcabber/xmpp_muc.c	Sat May 18 20:41:52 2019 +0200
@@ -122,9 +122,8 @@
   gchar *roomid;
   GSList *room_elt;
 
-  if (!xmpp_is_online() || !room)
+  if (!xmpp_is_online() || !room || !nickname)
     return;
-  if (!nickname)        return;
 
   roomid = g_strdup_printf("%s/%s", room, nickname);
   if (check_jid_syntax(roomid)) {