Prevent model restoration in unloaded areas

api.lua

@@ -315,6 +315,9 @@ meshnode.restore_all = function(parent, name)
 	local nodedata = {}
 	for _, ref in pairs(parent.nodes) do
 		local pos = meshnode.get_map_pos(ref, parent)
+		if not minetest.get_node_or_nil(pos) then
+			return
+		end
 		if name and minetest.is_protected(pos, name) then
 			return
 		end

init.lua

@@ -517,7 +517,8 @@ minetest.register_on_player_receive_fields(function(player, formname, fields)
 				entity.mesh_id = minetest.pos_to_string(pos)
 				entity:set_activated(false)
 			else
-				minetest.chat_send_player(name, S("Protected area").."!")
+				local msg = S("Protected or unloaded area")
+				minetest.chat_send_player(name, msg.."!")
 			end
 		end
 	end