Getting NullReferenceException despite assigning an object

I don't understand why am I getting the NullReferenceException error although I have already assigned a gameobject.

Code (CSharp):

1. public class PositionSavers : MonoBehaviour
2. {
3.     public GameObject tracked;
4.     private static int n = 0;
5.     private static Vector3[] objectPositions = null;
6.  
7.     private void Start()
8.     {
9.     }
10.  
11.     private void Update()
12.     {
13.         if(n < 500)
14.         {
15.             objectPositions[n] = tracked.transform.position;
16.             n++;
17.         }
18.         if(n == 500)
19.         {
20.             Save(objectPositions);
21.             n++;
22.         }
23.     }
24. }

 

You get null from there?

objectPositions[n] = tracked.transform.position;

Probably yes, your array is null

private static Vector3[] objectPositions = null;

. I don't see anywhere in code where you initialize it, so it'd be still null.

 

Thanks for replying!! I just solved the problem. I am a new learner to this. So sorry for the stupid question.