Help making this script keep working? Still Not Answered

Hi,

This script I made for a screen works fine apart from after a couple of times of jumping out of the seat and back into the seat, it breaks and I do not receive the GUI. What would be the fix to this?

This is the script;

seat = script.Parent.Seat
screen = script.Parent.Screen.Gui.Screen
gui = script.Parent.CheckInGui

seat.ChildAdded:connect(function(newWeld)
	character = newWeld.Part1.Parent
	player = game.Players:GetPlayerFromCharacter(character)
	if player.Backpack:FindFirstChild("Staff") then
		guiClone = gui:Clone()
		guiClone.Parent = player.PlayerGui
		guiClone.Main.Update.MouseButton1Click:connect(function(update)
			screen.Class.Text = guiClone.Main.Class.Text
			screen.Desk.Text = guiClone.Main.Desk.Text
			screen.Destination.Text = guiClone.Main.Destination.Text
		end)
	end
end)

seat.ChildRemoved:connect(function(removeWeld)
	screen.Class.Text = "Desk Closed"
	screen.Desk.Text = ""
	screen.Destination.Text = ""
	if guiClone then
		guiClone:Destroy()
	end
end)

Thanks Kieran

seat = script.Parent.Seat
screen = script.Parent.Screen.Gui.Screen
gui = script.Parent.CheckInGui
seat.ChildAdded:connect(function(newWeld)
    character = newWeld.Part1.Parent
    player = game.Players:GetPlayerFromCharacter(character)
    if player.Backpack:FindFirstChild("Staff") then
        guiClone = gui:Clone()
        guiClone.Parent = player.PlayerGui
        guiClone.Main.Update.MouseButton1Click:connect(function(update)
            screen.Class.Text = guiClone.Main.Class.Text
            screen.Desk.Text = guiClone.Main.Desk.Text
            screen.Destination.Text = guiClone.Main.Destination.Text
        end)
    end
end)
seat.ChildRemoved:connect(function(removeWeld)
    screen.Class.Text = "Desk Closed"
    screen.Desk.Text = ""
    screen.Destination.Text = ""
    if guiClone then
        guiClone:Destroy()
    end
end)

At Line 24 guiClone Is Destroyed Meaning That It Could Have Been Completely Destroyed out of the game, I recommend trying this on line 23 and 24

if guiClone then

guiClone.Transparency = 1 --Or Something Like this.

*NOTE Make Sure You Define everything in the gui so it all disappears