I'm making a IK door similar to gta v's ones but when making the hand ik target i get error because its nil

[TargetStudiosTester (WaIterWhite)]

i don’t understand this, if i click play with the IK target nil, no error, but if i change the value to nil by a script, error shows

script.Parent.Touched:Connect(function(b)
	
	local Player = game.Players:FindFirstChild(b.Parent.Name)
	
	if Player then
		local IKControl = Player.Character.HumanoidRootPart.IKControl_leftarm		
		local door = script.Parent.Parent.handIK
		
		IKControl.Target = door
		wait(2)
		IKControl.Target = nil -- **here i want to make the value nil but without giving the error, it needs to stay nil because when the player gets away from door, the arm needs to come back to normal.**

	end
end)

the error that shows in the output is this one:
Missing IkControl Target (x613) - Studio

[TargetStudiosTester (WaIterWhite)]

Ok, so instead of trying to make the Target nil, forget the target and play around with the Weight propriety, I can’t explain it really good, so just check the code, it’s a nice solution.

script.Parent.Touched:Connect(function(b)
	
	local Player = game.Players:FindFirstChild(b.Parent.Name)
	
	if Player then
		local IKControl = Player.Character.HumanoidRootPart.IKControl_leftarm		
		local door = script.Parent.Parent.handIK
		local hand_collision = Player.Character.HandCollision_l
		
		local ts = game:GetService("TweenService")
		local tween = ts:Create(IKControl, TweenInfo.new(1), {Weight = 1})
		local tween1 = ts:Create(IKControl, TweenInfo.new(0.5), {Weight = 0})

		tween:Play()
		hand_collision.CanCollide = true
		IKControl.Target = door
		task.wait(0.7)
		tween1:Play()
		hand_collision.CanCollide = false

	end
end)