My script to make an object bob up and down as an effect is not working.

Hello, after being fed up that animating an object in the animation panel is not as versatile is doing an “animation” in code, I made a script that will make an object bob up and down. It worked fine until I attempted to reference another script’s variable in order to tell it that my object must be matured first before it can bob up and down.

Error that I am getting (Only on the first frame when game starts):

NullReferenceException: Object reference not set to an instance of an object
BobScript.Update () (at Assets/Scripts/BobScript.cs:26)

	private float Bob;
	private bool BobIncreasing;
	public float BobSize;
	public float BobSpeed;
	public GameObject BobbingObject;
	public string BobbingAxis;
	public bool CanBob;
	public TreeAI TScript;
	private bool Adult;
	public bool BobWhenAdult;


	void Start () {
		Bob = 0.8f;
	}
	

	void Update () {
		if (CanBob == true) {
			Adult = TScript.Adult;
			if (Adult == true && BobWhenAdult == true){
			if (Bob < 1 - BobSize/10) {
				BobIncreasing = true;
					}
					if (Bob > 1) {
						BobIncreasing = false;
					}
					if (BobIncreasing == true) {
						Bob += 0.1f * BobSpeed * Time.deltaTime;
					}
					if (BobIncreasing == false){
						Bob += -0.1f * BobSpeed * Time.deltaTime;
					}
					if (BobbingAxis == "X"){
						BobbingObject.transform.localScale = new Vector3 (1 * Bob, 1, 1);
					}
					if (BobbingAxis == "Y"){
						BobbingObject.transform.localScale = new Vector3 (1, 1 * Bob, 1);
					}
					if (BobbingAxis == "Z") {
						BobbingObject.transform.localScale = new Vector3 (1, 1, 1 * Bob);
				}
			}
		}
	}
}

Your code is difficult to read. But have you tried:

var transform.position = new Vector3(transform.position.x, Mathf.Sin(Time.time), transform.position.z);