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);