diff -r a5acd6354845 -r 818255f49297 plugins/muc/muc.lib.lua
--- a/plugins/muc/muc.lib.lua	Mon Oct 05 22:19:55 2020 +0200
+++ b/plugins/muc/muc.lib.lua	Wed Oct 07 13:36:24 2020 +0200
@@ -372,12 +372,12 @@
 end
 
 function room_mt:get_disco_info(stanza)
-	local node = stanza.tags[1].attr.node or "";
+	local node = stanza.tags[1].attr.node;
 	local reply = st.reply(stanza):tag("query", { xmlns = "http://jabber.org/protocol/disco#info", node = node });
 	local event_name = "muc-disco#info";
 	local event_data = { room = self, reply = reply, stanza = stanza };
 
-	if node ~= "" then
+	if node and node ~= "" then
 		event_name = event_name.."/"..node;
 	else
 		event_data.form = dataform.new {