Attempted To Index A Nil Value (SaveScript)?

I have made this save script which worked at first but when I added new models it completely broke it and I have no clue why. It is supposed to save my models that have been placed into a folder in the workspace called SaveFolder. It saves it fine I think but it might be a problem loading the models and placing back into the folder. By the way my base models are stored in replicated storage in a Models folder. If anyone knows how to fix this it would be appreciated. I get the error on line 67!

-- Define
local players = game:GetService("Players");
local DataStoreService = game:GetService("DataStoreService");
local DataStore = DataStoreService:GetDataStore("TycoonSave");

local saveFolder = workspace.SaveFolder;
local saveTable = {};

-- Save function (will explain more in the function)
local function Save(plr)
	local key = "plr-"..plr.UserId; -- we need to have a key for each player
	
	local objects = saveFolder:GetChildren(); -- all the objects
	
	-- Loops through all the objects in the saveFolder
	for i, obj in pairs(objects) do
		if obj then
			-- Inserts the name and position of the model
			table.insert(saveTable, {
				["Name"] = obj.Name;
				["CFS"] = { -- Positions are a bit complex
					["X"] = obj.PrimaryPart.CFrame.X;
					["Y"] = obj.PrimaryPart.CFrame.Y;
					["Z"] = obj.PrimaryPart.CFrame.Z;
					["ROT"] = obj.PrimaryPart.Orientation.Y
				}
			})
			
			-- This is simple though we can access this again by saying saveTable.CFS.AXIS
		end
	end
	
	local success, err = pcall(function() -- prevents script from stopping
		DataStore:SetAsync(key, saveTable); -- Saves the table
	end)
	
	-- If the saving failed
	if not success then
		warn("Failed to over-write data"..tostring(err));
		return;
	end
end

-- Load function (will explain more in the function)
local function Load(plr)
	local key = "plr-"..plr.UserId; -- we need the players key so we can access their data
	
	local savedTycoon; -- We will set this in a pcall()
	
	local success, err = pcall(function()
		savedTycoon = DataStore:GetAsync(key); -- reads the data saved
	end)
	
	-- if error
	if not success then
		warn("Failed to read data"..tostring(err));
		return;
	end
	
	-- If there was no error and if there is data to be loaded
	if savedTycoon then
		wait(1);
		
		for i, obj in pairs(savedTycoon) do
			if obj then
				-- We can use the saved data to access the name: obj.Name will give us the name
				local savedModel = game.ReplicatedStorage.Models:FindFirstChild(obj.Name):Clone();
				
				if savedModel then
					-- Positions the model
					savedModel:SetPrimaryPartCFrame(CFrame.new(obj.CFS.X, obj.CFS.Y, obj.CFS.Z) * CFrame.Angles(0, math.rad(obj.CFS.ROT), 0));
					savedModel.PrimaryPart.Transparency = 1;
					
					for index, value in pairs(savedModel:GetDescendants()) do
						if value then
							if value:IsA("BasePart") then
								value.CanCollide = true
								value.Transparency = 0
							end
						end
					end
					
					savedModel.PrimaryPart.Transparency = 1
					savedModel.PrimaryPart.CanCollide = false;
					savedModel.Parent = workspace.SaveFolder;
				end
			end
		end
	else
		Save(plr)
	end
end

game.ReplicatedStorage.Events.ClearPlot.OnServerEvent:Connect(function()
	for i, v in pairs(workspace.SaveFolder:GetChildren()) do
		if v then
			v:Destroy();
			wait(0, 1);
		end
	end
end)

-- Calls
players.PlayerAdded:Connect(Load);
players.PlayerRemoving:Connect(Save);
game.ReplicatedStorage.Events.Save.OnServerEvent:Connect(Save);