How can I open my shop after I close it?

I made a shop for an rpg in roblox and I can open it and close it, but after I close it, it won't open again and says "Already have GUI." My shop script it

button = script.Parent

function onTouch(part)
    if part.Parent:FindFirstChild("Humanoid") ~= nil then
        local player = Game.Players:GetPlayerFromCharacter(part.Parent)
        if player ~= nil then
            local GUI = Game.ReplicatedStorage:FindFirstChild(script.Parent.ShopGUI.Value)
            local AlreadyHaveGUI = player.PlayerGui:FindFirstChild(script.Parent.ShopGUI.Value)
            if AlreadyHaveGUI == nil then
            GUI:Clone().Parent = player.PlayerGui
            else print("Already have GUI!")
            end
        end
    else print("Humanoid not found!")
    end
end

button.Touched:connect(onTouch)

and my close script is

function close()
script.Parent.Parent.Parent:Remove()
end

script.Parent.MouseButton1Click:connect(close)