attempt to index local 'clone' (a nil value)?

Ok, so, I have this script:

game.Players.PlayerAdded:connect(function(player)

    repeat wait() until player.Character

    local random = math.random()

    local clone = player.Character:Clone()

    clone.Parent = game.ReplicatedStorage
    clone.Name = random.." player"

    player.Character:Destroy()

    repeat wait() until not player.PlayerGui.Intro.Develop

    local backClone = clone:Clone()
    backClone.Parent = game.Workspace
    backClone.Name = player
end)

And I have this error:

Workspace.Script:9: attempt to index local 'clone' (a nil value)

Ok, so, what's happening? It says I didn't define the 'clone' variable on line 9, but I did, on line 7!