diff -r b9e56f46916e -r 7277797a4988 plugins/muc/mod_muc.lua
--- a/plugins/muc/mod_muc.lua	Sun Jun 03 14:43:15 2018 +0200
+++ b/plugins/muc/mod_muc.lua	Sun Jun 03 14:45:04 2018 +0200
@@ -285,7 +285,7 @@
 
 module:hook("muc-room-pre-create", function (event)
 	local room = event.room;
-	room:set_public(module:get_option_boolean("muc_rooom_default_public", room:get_public()));
+	room:set_public(module:get_option_boolean("muc_rooom_default_public", false));
 	room:set_persistent(module:get_option_boolean("muc_rooom_default_persistent", room:get_persistent()));
 	room:set_members_only(module:get_option_boolean("muc_rooom_default_members_only", room:get_members_only()));
 	room:set_moderated(module:get_option_boolean("muc_rooom_default_moderated", room:get_moderated()));