Custom replication issues

Hi guys. I had system which will add tons of attribute values to object, and allat mass will replicate to client by roblox built in systems, all good.
But I had some problems, like need to store multidimensional tables, and due to that I switched to module with remote event replication.
But this solution has one flaw - objects may not exist on client, and replication attempt will fail.
How I can solve this, wait for a part to be replicated to client?