Cannot delete weld coming back with nil?

I'm trying to make something where if an object is touched it will weld that part to the main part. It works but when I run an event from a GUI to delete the weld it comes back as nil with this error code: attempt to index nil with 'Destroy'

Heres the script:

local main = script.Parent
local weld

script.Parent.Touched:Connect(function(plart)
	local other = plart --plart was a typo (edit)
	local weld = Instance.new("Weld", main)
	weld.C0 = main.CFrame:Inverse() * other.CFrame
	weld.Part0 = main
	weld.Part1 = other	
end)

game.ReplicatedStorage.DelWeld.OnServerEvent:Connect(function()
	weld:Destroy()
	script.Disabled = true	
end)	

If anyone could help me that would be appreciated.

Thank you.