Help with handle error?

function evalKill(hit)
    if slashing then
        if hit.Parent~=nil and hit.Parent:FindFirstChild("Humanoid")~=nil and hit.Parent.Humanoid.Health>0 and not hit:IsDescendantOf(script.Parent.Parent) then
            if hit.Parent:FindFirstChild("Head")~=nil then
                for _,s in ipairs(hit.Parent.Head:GetChildren()) do
                    if s.className=="Sound" then
                        s:Remove()
                    end
                end
                script.Parent.Handle.Kill:Clone().Parent = hit.Parent.Head
                hit.Parent.Head.Kill:Play()
                game.Debris:AddItem(hit.Parent.Head.Kill,2)
            end
            hit.Parent.Humanoid:TakeDamage(100)
        end 
    end
end

script.Parent:FindFirstChild("Handle").Touched:connect(evalKill) -- ERROR HERE

Error Client 21:48:15.382 - Players.Player1.Backpack.Knife.LocalScript:133: attempt to index a nil value This seems to have the error. I don't understand how it is a 'nil' value, as the script.Parent does have a Handle inside it, so I don't see why this should be breaking.

It seems to work perfectly on studio, but not when I have a server running.