Help with Gui script?

I wnat to do a tool which gives me stuff when I press a key, already did it and it works, the bug isn't when it gives but when I unequip the tool and equip it again the gui duplicates and so on.If I press when I't sduplicate I have that gui stuck in my screen forever.I've made a function that makes the gui disapear when I deselect the hopperbin and it worked but if I keep selecting and deselecting the hopper bin it duplicates.Here's the script:

wait(3)
Player = script.Parent.Parent.Parent
n = script.Parent
mouse = Player:GetMouse()
c = Player.Character
debounce =  false

function Equiped()
	h = Instance.new("ScreenGui", Player.PlayerGui)
	h.Name = "ElementGui"
	a = Instance.new("TextLabel", h)
	a.BackgroundColor3 = Color3.new(170/255, 255/255, 0/255)
	a.Visible = true
	a.Position = UDim2.new(0.3, -100, 0.3, 0)
	a.Size = UDim2.new(0.3, 200, 0.3, 50)
	a.BackgroundTransparency = 0.5
	a.Text = "F-Fire ; L-Lightning ; E-Earth ; R-Wind ; W-Water!"
	mouse.KeyDown:connect(function(key)
		local Key = key:lower()
		if key == "r" and debounce == false then
			debounce = true
			local emi = game.Lighting:WaitForChild("Wind")
    		emi:Clone().Parent = Player:WaitForChild("Backpack")
			local emi2 = game.Lighting:WaitForChild("Wind Jutsu")
    		emi2:Clone().Parent = Player:WaitForChild("Backpack")
			h:remove()
			n:remove()
		end
		if key == "w" and debounce == false then
			debounce = true
			local emi = game.Lighting:WaitForChild("Water")
    		emi:Clone().Parent = Player:WaitForChild("Backpack")
			local emi2 = game.Lighting:WaitForChild("Water Jutsu")
    		emi2:Clone().Parent = Player:WaitForChild("Backpack")
			h:remove()
			n:remove()
		end
		if key == "f" and debounce == false then
			debounce = true
			local emi = game.Lighting:WaitForChild("Fire")
    		emi:Clone().Parent = Player:WaitForChild("Backpack")
			local emi2 = game.Lighting:WaitForChild("Fire Jutsu")
			emi2:Clone().Parent = Player:WaitForChild("Backpack")
			h:remove()
			n:remove()
		end
		if key == "l" and debounce == false then
			debounce = true
			local emi = game.Lighting:WaitForChild("Lightning")
    		emi:Clone().Parent = Player:WaitForChild("Backpack")
			local emi2 = game.Lighting:WaitForChild("Lighting Jutsu")
    		emi2:Clone().Parent = Player:WaitForChild("Backpack")
			h:remove()
			n:remove()
		end
		if key == "e" and debounce == false then
			debounce = true
			local emi = game.Lighting:WaitForChild("Pillar")
    		emi:Clone().Parent = Player:WaitForChild("Backpack")
			local emi2 = game.Lighting:WaitForChild("Earth Jutsu")
    		emi2:Clone().Parent = Player:WaitForChild("Backpack")
			h:remove()
			n:remove()
		end
	end) 
	
end

function Unequi()
		for i, v in pairs(Player.PlayerGui:GetChildren()) do
			if v:IsA("ScreenGui") and v.Name == "ElementGui" then
				v:remove()
			end
		end
end

function onDeselect()
	n.Deselected:connect(function() Unequi() end)
end

function onSelected()
	n.Selected:connect(function() Equiped() end)
end

n.Selected:connect(onSelected)
n.Deselected:connect(onDeselect)

Try adding an if check to "Equiped":

function Equiped()
	   if Player.PlayerGui:WaitForChild("ElementGui") == nil then
		   h = Instance.new("ScreenGui", Player.PlayerGui)
		   h.Name = "ElementGui"
		   a = Instance.new("TextLabel", h)
		   a.BackgroundColor3 = Color3.new(170/255, 255/255, 0/255)
		   a.Visible = true
		   a.Position = UDim2.new(0.3, -100, 0.3, 0)
		   a.Size = UDim2.new(0.3, 200, 0.3, 50)
		   a.BackgroundTransparency = 0.5
		   a.Text = "F-Fire ; L-Lightning ; E-Earth ; R-Wind ; W-Water!"
		   mouse.KeyDown:connect(function(key)
		       local Key = key:lower()
		       if key == "r" and debounce == false then
		           debounce = true
		           local emi = game.Lighting:WaitForChild("Wind")
		           emi:Clone().Parent = Player:WaitForChild("Backpack")
		           local emi2 = game.Lighting:WaitForChild("Wind Jutsu")
		           emi2:Clone().Parent = Player:WaitForChild("Backpack")
		           h:remove()
		           n:remove()
		       end
		       if key == "w" and debounce == false then
		           debounce = true
		           local emi = game.Lighting:WaitForChild("Water")
		           emi:Clone().Parent = Player:WaitForChild("Backpack")
		           local emi2 = game.Lighting:WaitForChild("Water Jutsu")
		           emi2:Clone().Parent = Player:WaitForChild("Backpack")
		           h:remove()
		           n:remove()
		      end
		      if key == "f" and debounce == false then
		      	 debounce = true
		         local emi = game.Lighting:WaitForChild("Fire")
		         emi:Clone().Parent = Player:WaitForChild("Backpack")
		         local emi2 = game.Lighting:WaitForChild("Fire Jutsu")
		         emi2:Clone().Parent = Player:WaitForChild("Backpack")
	 	         h:remove()
		         n:remove()
		      end
		        if key == "l" and debounce == false then
		            debounce = true
		            local emi = game.Lighting:WaitForChild("Lightning")
		            emi:Clone().Parent = Player:WaitForChild("Backpack")
		            local emi2 = game.Lighting:WaitForChild("Lighting Jutsu")
		            emi2:Clone().Parent = Player:WaitForChild("Backpack")
		            h:remove()
		            n:remove()
		        end
		        if key == "e" and debounce == false then
		            debounce = true
		            local emi = game.Lighting:WaitForChild("Pillar")
		            emi:Clone().Parent = Player:WaitForChild("Backpack")
		            local emi2 = game.Lighting:WaitForChild("Earth Jutsu")
		            emi2:Clone().Parent = Player:WaitForChild("Backpack")
		            h:remove()
		            n:remove()
		        end
		    end) 

	   end
end