Other Null Reference Exception with all variables having a value

NullReferenceException: Object reference not set to an instance of an object
move_camera.Update () (at Assets/move_camera.cs:37)

I have met on this error and can't seem to find where the error is, could anyone please help me out

Code (CSharp):

1. using UnityEngine;
2.  
3. public class move_camera : MonoBehaviour
4. {
5.     public float yvalue;
6.     public Vector3 campos;
7.  
8.     // Declare the player variable at the top of the class
9.     GameObject player;
10.     GameObject camera;
11.  
12.     // Start is called before the first frame update
13.     void Start()
14.     {
15.         // Initialize the player variable when the script is first loaded
16.         player = GameObject.FindWithTag("Player");
17.  
18.         Debug.Log("Player object: " + player);
19.         Debug.Log("Player object: " + camera);
20.     }
21.  
22.     // Update is called once per frame
23.     void Update()
24.     {
25.         // If the player object was found, get its y position
26.         if (player != null)
27.         {
28.             yvalue = player.transform.position.y;
29.  
30.             Vector3 campos2 = new Vector3(0, 9, -10);
31.  
32.             // Change camera position based on player position
33.             if (yvalue > 6)
34.             {
35.                 Debug.Log("Player object: " + player);
36.                 Debug.Log("Player object: " + camera);
37.                 Camera.main.transform.position = campos2;
38.  
39.             }
40.         }
41.     }
42. }

I have tested and both "player" and "camera" still exists when the error happens

 

This is the console, the first two are when the game starts and the last three is when yvalue > 6

 

The error tells you what line the problem is on. Here's a on how to fix Null Reference Exceptions by one of our regulars.

https://forum.unity.com/threads/how-to-fix-a-nullreferenceexception-error.1230297/

 

You tested that you assigned a camera to your

camera

variable, yes, but you don't use this variable anywhere. Instead you use the static shortcut property

Camera.main

which searches for the first camera that is tagged "MainCamera". If there is no such camera, it would return null. Your line numbers seems to be off since the error says the exception happens in line 40. So check your actual source file and check the actual line it tells you. I would bet that it's the Camera.main line and that you don't have a camera that is tagged MainCamera.