How can I fix this shop button that opens and closes when you click on it?

Whenever I try it in test mode, it works just fine. Except whenever I try it in game, it fails. I have no clue why.

local Button = script.Parent
Frame = script.Parent.Parent.Frame

function onClick()
if Frame.Visible == false then
Frame.Visible = true
elseif Frame.Visible == true then
Frame.Visible = false
end
end

Button.MouseButton1Click:connect(onClick)

Layout - http://prntscr.com/gp3wya

Here. I fixed it.

local Button = script.Parent
Frame = script.Parent.Parent.Frame
local toggle = false

script.Parent.MouseButton1Click:Connect(function()
if toggle == false then
Frame.Visible = true
toggle = true
else
Frame.Visible = false
toggle = false
end)