Why is this considered a nil value?

I am making a script so when you die, it sets your spawn to the stage you are at. This is my code:

delay(2,workspace.ChildAdded:connect(function(obj) --the delay makes it wait 2 seconds. it's for test purposes only, will be removed later
    local plr = game.Players:GetPlayerFromCharacter(obj)
    if plr ~= nil then
        local ls = plr.leaderstats
        local val = ls.Stage.Value
        local spawnr = workspace.Spawns:FindFirstChild(val)
        if obj:FindFirstChild("Torso") ~= nil then
            obj.Torso.CFrame = spawnr.CFrame + Vector3.new(0,3,0)
        elseif obj:FindFirstChild("UpperTorso") ~= nil then
            obj.UpperTorso.CFrame = spawnr.CFrame + Vector3.new(0,3,0)
        end
    end
end))

Everything is working fine, except of this one error:

attempt to index local 'spawnr' (a nil value)

It doesn't make sense, as I made it a variable, shown here

local spawnr = workspace.Spawns:FindFirstChild(val)

What is my problem here?