I seem to get an error?

--Interact Script

local plr = game.Players.LocalPlayer
local mouse = plr:GetMouse()
local cam = game.Workspace.CurrentCamera
local deb = false
local door = game.Workspace.Door.Model.door



while true do wait()
    if mouse.Target:FindFirstChild("canInteract") then
        if deb == false then deb = true
            script.Parent.Background.Visible = true
            mouse.KeyDown:connect(function(Key)
                if Key == "e" then 
                if mouse.Target.canInteract.Value == "door" then
                door.Script.Disabled = false
                wait(4)
                door.Script.Disabled = true
                end
                end 
            end)
            wait()
            deb = false
        end
    else
        if deb == false then deb = true
            script.Parent.Background.Visible = false
            wait()
            deb = false
        end
    end
end

Error:Players.Player.PlayerGui.Interact.interactScript:12: attempt to index field 'Target' (a nil value)

Help anyone? This is a door interaction script. Everything works but it keeps saying the target is a nil value. Target is the door