Script gives me an error and says parent even tho theres no parent in any line?

trying to make a hitch script, but it gives me an error saying: 21:30:16.068 - Players.ieatandisbaconhair.PlayerGui.ScreenGui.LocalScript:8: attempt to index field 'Parent' (a nil value)

script:

local plr = game.Players.LocalPlayer
game:GetService("UserInputService").InputBegan:Connect(function(key)
    if key.KeyCode == Enum.KeyCode.H then
        for i,v in pairs(game.Workspace.Vehicles:GetChildren()) do
            if v.CarOwner then
            local mag = (v.HingePart.Position-v.Trailer.HingePart.Position).Magnitude
            if mag <= 1 then
                local mag2 = (v.HingePart.Position-plr.Character.HumanoidRootPart.Position).Magnitude
                if mag2 <= 10 then
                if v.CarOwner.Value == game.Players.LocalPlayer.Name then
                    if v.IsHitched.Value == false then
                        v.HitchTrailer:FireServer()
                        v.IsHitched.Value = true
                    elseif v.IsHitched.Value == true then
                        v.UnHitchTrailer:FireServer()
                        v.IsHitched.Value = false
                    end
                end
                end
            end
            end
        end
    end
end)