Any ideas why this doesnt work?

I made a script, which works while testing through studio, but when I get in the actual game, it doesn't. Any ideas?

-- Made by Director1406

script.Parent.MouseButton1Click:connect(function()
    local Level1 = script.Parent

    if Level1.Visible == true then
        game:GetService("TeleportService"):Teleport(284418914, player)      
    end 

end)