Trying to get rid of "Mouse no longer active" error?

I'm trying to mimic the effect in those Dragon Ball games where your character follows your mouse as you're about to shoot something. This is a local script in a hopperbin:

player = game.Players.LocalPlayer
repeat wait() until player.Character
char = player.Character
active = false

function onSelected(mouse)
    active = true
    local gyro

    if not char.Torso:FindFirstChild("FollowMouseGyro") then
        gyro = Instance.new("BodyGyro", char.Torso)
        gyro.Name = "FollowMouseGyro"
        gyro.maxTorque = Vector3.new(math.huge, math.huge, math.huge)
    end

    while active do
        gyro.cframe = CFrame.new(char.Torso.CFrame.p, mouse.Hit.p)
        game:GetService("RunService").RenderStepped:wait()
    end
end

script.Parent.Selected:connect(onSelected)

script.Parent.Deselected:connect(function()
    active = false

    if char.Torso:FindFirstChild("FollowMouseGyro") then
        char.Torso.FollowMouseGyro:Destroy()
    else return
    end
end)

And that will give me the "Mouse no longer active" error whenever I deselect the hopperbin, but it will still work just fine. How do I get rid of this error?