Http:JSONDecode: Argument 1 is missing or nil?

Http:JSONDecode error: Argument 1 is missing or nil

I've been trying to do a script where you can save a table to a datastore. Here is my current script:

game.Players.PlayerAdded:Connect(function(player)
    if ds:GetAsync(player.UserId) ~= nil then
        local toLoad = Http:JSONDecode(ds:GetAsync(player.UserId))

        local statStats = toLoad.stats
        local cashCash = toLoad.cash

        if statStats == nil then
            local stats = Instance.new("Folder")
            stats.Name = "leaderstats"
            stats.Parent = player

            local cash = Instance.new("IntValue")
            cash.Name = "Cash"
            cash.Parent = stats

            wait(10)

            cash.Value = math.random(1,9999999)

            wait(5)

            repeat
                cash.Value = math.random(1,9999999)
                be:Fire(cash.Value, player.Name)
                wait(5)
            until player.Parent == nil

            game.Players.PlayerRemoving:Connect(function(plr)
                local save = {}
                table.insert(save, 1, cash)
                table.insert(save, 2, stats)

                ds:SetAsync(plr.UserId, save)
            end)
        elseif (statStats ~= nil and statStats:IsA("Folder")) or statStats ~= nil then
            statStats.Name = "leaderstats"
            statStats.Parent = player

            cashCash.Name = "Cash"
            cashCash.Parent = statStats

            wait(10)

            repeat
                wait(5)
                cashCash.Value = math.random(1,9999999)
                be:Fire(cashCash.Value, player.Name)
            until player.Parent == nil

            game.Players.PlayerRemoving:Connect(function(plr)
                local save = {}
                table.insert(save, 1, cashCash)
                table.insert(save, 2, statStats)

                ds:SetAsync(plr.UserId, Http:JSONEncode(save))

                warn(ds:GetAsync(plr.UserId))
            end)
        end
    else
        warn("Datastore is ", nil, "!")

        local stats = Instance.new("Folder")
        stats.Name = "leaderstats"
        stats.Parent = player

        local cash = Instance.new("IntValue")
        cash.Name = "Cash"
        cash.Parent = stats

        wait()

        cash.Value = math.random(1,9999999)

        wait(5)

        repeat
            cash.Value = math.random(1,9999999)
            be:Fire(cash.Value, player.Name)
            wait(5)
        until player.Parent == nil

        game.Players.PlayerRemoving:Connect(function(plr)
            local save = {}
            table.insert(save, 1, cash)
            table.insert(save, 2, stats)

            ds:SetAsync(plr.UserId, save)
        end)
    end
end)

Everytime i try to get the table, it returns nil. Someone know why?