Function arg is always nil for some reason

[shadowbendy123 (totallynotannpc)]

Im making an Open/Close script but for some reason the function arg is always nil even tho im passing an object (its a frame).

local OpenedWindow
local WindowsFolder = script.Parent.Parent:WaitForChild("Inventories")
local AbilitiesWindow = WindowsFolder:WaitForChild("Abilities")
local PassivesWindow = WindowsFolder:WaitForChild("Passives")
local MainWeaponsWindow = WindowsFolder:WaitForChild("Main Weapons")
local MainWeaponButton = script.Parent:WaitForChild("f")
local PassiveButton = script.Parent:WaitForChild("s")
local AbilityButton1 = script.Parent:WaitForChild("t")
local AbilityButton2 = script.Parent:WaitForChild("fo")
local AbilityButton3 = script.Parent:WaitForChild("fi")

--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

local function OpenWindow(Window)
	print(Window)
	Window.Visible = true
	if OpenedWindow ~= nil then
		OpenedWindow.Visible = false
		OpenedWindow = Window
	else
		OpenedWindow = Window
	end
end

local function CloseWindow(Window)
	Window.Visible = false
	OpenedWindow = nil
end

--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

AbilityButton1.MouseButton1Click:Connect(OpenWindow,AbilitiesWindow)
AbilityButton2.MouseButton1Click:Connect(OpenWindow,AbilitiesWindow)
AbilityButton3.MouseButton1Click:Connect(OpenWindow,AbilitiesWindow)
MainWeaponButton.MouseButton1Click:Connect(OpenWindow,MainWeaponsWindow)
PassiveButton.MouseButton1Click:Connect(OpenWindow,PassivesWindow)

[bytesleuth]

AbilityButton1.MouseButton1Click:Connect(function()
OpenWindow(AbilitiesWindow)
end)

change all the listeners to look like this

[shadowbendy123 (totallynotannpc)]

i know i can do that but i wanted to try going for cleaner connections this time, but ehh it doesnt work so thanks anyways!