How do I fix "Attempt to index local 'Weapon' (a nil value)"?

Hello, so I'm currently making a script that prints out

1. Killer Name
2. Killer Weapon

Whenever I go to test it I get an error in my output saying Workspace.Script:12: attempt to index local 'Weapon' (a nil value) How would I go about fixing this? Here's my full script

Players = game:GetService("Players") 
Players.PlayerAdded:connect(function(Player) 

    Player.CharacterAdded:connect(function(Character) 
        local Humanoid = Character:WaitForChild("Humanoid") 
        Humanoid.Died:connect(function() 
            if Humanoid:FindFirstChild("creator") ~= nil then 
                local Killer = Humanoid.creator.Value  
               local Weapon = Killer:FindFirstChildOfClass("Tool") if true then
                end 
                print (Killer.Name)
                print (Weapon.Name) 
            end 
        end)
    end)
end)

The player's humanoid has a creator value, what type of variable is it?
If it's an object value, then it's referring to the player in game.Player The way to fix it is to add a string value and set it as the killer, so replace it with workspace[creator.Value]
Hoped this helps!