Added a check against constant reading of the array if the player is not on the server.

luaentity.lua

@@ -352,7 +352,14 @@ local move_entities_globalstep_part2 = function(dtime)
 	if not luaentity.entities then
 		luaentity.entities = read_entities()
 	end
+	--minetest.log("action", "Dump: " .. dump(luaentity.entities))
 	for _, entity in pairs(luaentity.entities) do
+		--minetest.log("action", "entity " ..  type(entity.owner))
+		if entity.owner ~= nil then
+			local object = minetest.env:get_player_by_name(entity.owner)
+			if object then
+				--minetest.chat_send_all("online: " .. dump(entity.owner))
+				--minetest.log("action", "pipeworks: активная передача по трубам игрок в сети: " .. entity.owner)
 				local master = entity._attached_entities_master
 				local master_def = master and entity._attached_entities[master]
 				local master_entity = master_def and master_def.entity
@@ -390,6 +397,8 @@ local move_entities_globalstep_part2 = function(dtime)
 				end
 			end
 		end
+	end
+end
 
 -- dtime after which there is an update (or skip).
 local dtime_threshold = pipeworks.entity_update_interval