Nil value even though variable is already described?

Hiya! In the script i have, I was trying to make an owner's only door. only problem is... when my script describes the variable of tycoon on line 14, on line 15 the script tells me it has a nil value. Help?

dad = script.Parent
door = dad.Parent
owner = door.Parent.Owner

local active = 0

function onTouched(part)
    local human = part.Parent:findFirstChild("Humanoid")
    if human ~= nil and active == 0 then
        active = 1
        local player = game.Players:findFirstChild(part.Parent.Name)
        if player ~= nil then
            if owner.Value == "" then
                local tycoon = player:findFirstChild("Tycoon") -- describes tycoon
                if tycoon.Value == 0 then -- where error eccours
                    tycoon.Value = 1
                    owner.Value = player.Name
                    local message = Instance.new("Message")
                    message.Text = "You now own this tycoon!"
                    message.Parent = player
                    wait(3)
                    door.Name = "Tycoon Owner: " .. owner.Value
                    message:remove()
                else
                    local message = Instance.new("Message")
                    message.Text = "You already own another tycoon!"
                    message.Parent = player
                    wait(3)
                    message:remove()
                end
            end
        end
    end
    active = 0
end

dad.Touched:connect(onTouched)

Here's what the output says.

10:00:49.307 - Workspace.MrNiceGuy's Beginner Tycoon Kit.Tycoon.This Tycoon has no owner..OwnerDoor.[MNG]-OwnerScript:15: attempt to index local 'tycoon' (a nil value)