diff --git a/builtin/mainmenu/common.lua b/builtin/mainmenu/common.lua
index bcb075f9..5cd16a9e 100644
--- a/builtin/mainmenu/common.lua
+++ b/builtin/mainmenu/common.lua
@@ -307,7 +307,7 @@ function menu_worldmt(selected, setting, value)
 		local filename = world.path .. DIR_DELIM .. "world.mt"
 		local world_conf = Settings(filename)
 
-		if value then
+		if value ~= nil then
 			if not world_conf:write() then
 				core.log("error", "Failed to write world config file")
 			end
@@ -320,14 +320,14 @@ function menu_worldmt(selected, setting, value)
 	end
 end
 
-function menu_worldmt_legacy()
-	local modes = {"creative_mode", "enable_damage"}
-	for _, mode in pairs(modes) do
-		local mode = menu_worldmt(selected, ""..mode.."")
-		if mode then
-			core.setting_set(""..mode.."", mode)
+function menu_worldmt_legacy(selected)
+	local modes_names = {"creative_mode", "enable_damage"}
+	for _, mode_name in pairs(modes_names) do
+		local mode_val = menu_worldmt(selected, mode_name)
+		if mode_val ~= nil then
+			core.setting_set(mode_name, mode_val)
 		else
-			menu_worldmt(selected, ""..mode.."", core.setting_get(""..mode..""))
+			menu_worldmt(selected, mode_name, core.setting_get(mode_name))
 		end
 	end
 end
diff --git a/builtin/mainmenu/tab_server.lua b/builtin/mainmenu/tab_server.lua
index 2362d32a..3459f3f2 100644
--- a/builtin/mainmenu/tab_server.lua
+++ b/builtin/mainmenu/tab_server.lua
@@ -69,7 +69,7 @@ local function main_button_handler(this, fields, name, tabdata)
 		local event = core.explode_textlist_event(fields["srv_worlds"])
 		local selected = core.get_textlist_index("srv_worlds")
 
-		menu_worldmt_legacy()
+		menu_worldmt_legacy(selected)
 
 		if event.type == "DCL" then
 			world_doubleclick = true
diff --git a/builtin/mainmenu/tab_singleplayer.lua b/builtin/mainmenu/tab_singleplayer.lua
index 916b0c18..a7cf5120 100644
--- a/builtin/mainmenu/tab_singleplayer.lua
+++ b/builtin/mainmenu/tab_singleplayer.lua
@@ -107,7 +107,7 @@ local function main_button_handler(this, fields, name, tabdata)
 		local event = core.explode_textlist_event(fields["sp_worlds"])
 		local selected = core.get_textlist_index("sp_worlds")
 
-		menu_worldmt_legacy()
+		menu_worldmt_legacy(selected)
 
 		if event.type == "DCL" then
 			world_doubleclick = true