Script crashing game help?

This script is a regular script and will delete it self after exploding, but it crashes after it hits. I can't identify the problem.

script.Parent.Touched:connect(function()
	local ex = Instance.new("Explosion")
	ex.BlastRadius = 5
	ex.BlastPressure = 0
	ex.Position = script.Parent.Position
	ex.Parent = script.Parent
	ex.Hit:connect(function(hit)
		if hit.Parent:FindFirstChild("Humanoid") then
			hit.Parent.Humanoid:TakeDamage(20,30)
		end
	script.Parent:Destroy()
	end)
end)