GetAsync in DataStore not working for a JSON string?

I am trying to make an inventory system for my game. Right now I am trying to make it save. But it is saying that the GetSaved variable is nil and although it is nil, it still goes through the if statement.

local DSService = game:GetService('DataStoreService'):GetDataStore('NotTheActualKey123')
local HttpService = game:GetService('HttpService')
game.Players.PlayerAdded:connect(function(plr)
    -- Define variables
    local uniquekey = 'id-'..plr.userId
    local plrFolder = Instance.new("Folder", plr)
    plrFolder.Name = "Inventory"
    local equippedFolder = Instance.new("Folder", plrFolder)
    equippedFolder.Name = "Equipped"
    local item = Instance.new("StringValue", equippedFolder)
    item.Name = "Item"

    -- GetAsync
    local GetSaved = DSService:GetAsync(uniquekey)
    if GetSaved ~= nil then
        plrFolder = HttpService:JSONDecode(GetSaved[1])
    else
        local Inventoryfolder = plrFolder:GetChildren()
        local NumbersForSaving = HttpService:JSONEncode(Inventoryfolder)
        DSService:SetAsync(uniquekey, NumbersForSaving)
    end
end)

game.Players.PlayerRemoving:connect(function(plr)
    local Inventoryfolder = plr.Inventory:GetChildren()
    local uniquekey = 'id-'..plr.userId
    local Savetable = HttpService:JSONEncode(Inventoryfolder)
    DSService:SetAsync(uniquekey, Savetable)    
end)

Error in the output was from the online mode and the only error it gives me.