Objects in list turning to null

Hi everyone,

I have encountered a strange issue while filling up a list of GameObjects, and I hope someone could clarify what is going on here.

I go through the gameobjects of a public array, filled with prefabs assigned in the inspector, I instantiate and add them to a list. This is the code.

Code (CSharp):

1.  
2. List<GameObject> listCharacter = new List<GameObject>();
3.  
4. .
5. .
6. .
7.  
8. for (int i = 0; i < CharacterManager.Instance.characters.Length; i++)
9.             {
10.                 int deltaIndex = i - currentCharacterIndex;
11.  
12.                 GameObject character = Instantiate(CharacterManager.Instance.characters[i], centerPoint, Quaternion.Euler(originalRotation.x, originalRotation.y, originalRotation.z));
13.                 /*Character charData = character.GetComponent<Character>();
14.                 //character.GetComponent<Rigidbody>().useGravity = false;
15.                 if (character.GetComponent<PlayerBallController>()!=null)
16.                 {
17.                     Component ballController = character.GetComponent<PlayerBallController>();
18.                     Destroy(ballController);
19.                 }
20.  
21.                 //charData.characterSequenceNumber = i;
22.                
23.                 character.transform.localScale = originalScale;
24.                 //character.transform.position = centerPoint + new Vector3(deltaIndex * characterSpace, 0, 0);
25.  
26.                 // Set color based on locking status
27.                 //Renderer charRdr = character.GetComponentInChildren<Renderer>();
28.  
29.                 //if (charData.IsUnlocked)
30.                 //    charRdr.material.SetColor("_Color", Color.white);
31.                 //else
32.                 //    charRdr.material.SetColor("_Color", lockColor);
33.  
34.                 // Set as child of this object
35.                 character.transform.parent = transform;
36.                 switch (scrollerStyle)
37.                 {
38.                     case ScrollerStyle.Line:
39.                         character.transform.localPosition += new Vector3(deltaIndex * characterSpace, 0, 0);
40.                         break;
41.                     case ScrollerStyle.Circle:
42.                         character.transform.localPosition = transform.InverseTransformPoint(centerPoint) + new Vector3(Mathf.Sin(-currentAngle + i * characterAngleSpace), 0, -Mathf.Cos(-currentAngle + i * characterAngleSpace)) * characterScrollerRadius;
43.                         break;
44.                     default:
45.                         break;
46.                 }
47.                 // Set layer for camera culling
48.                 character.gameObject.layer = LayerMask.NameToLayer("CharacterSelectionUI");
49.                 //character.transform.GetChild(1).gameObject.layer = LayerMask.NameToLayer("CharacterSelectionUI");*/
50.  
51.                 listCharacter.Add(character);
52.             }

(As you can see, I commented everything trying to find the issue but it is still happening)

The thing is that, whenever the GameObject "character" gets a new value, the previous value that it had and was added to the list "listCharacter" in the previous iterations turns to null, as if it was just like a reference to the object instead of a clone of it.

So dividing the process in iterations, this is what is happening.

After the first iteration everything works fine.
The list is:
list [0] = gameobject1

After the second iteration, when the Instantiate line is executed (I debugged it), the list[0] gameobject "disappear" and turns to null. So I end up with this list:
list[0] = null
list[1] = gameobject2

After the third iteration the same:
list[0] = null
list[1] = null
list[2] = gameobject3

After the fourth:
list[0] = null
list[1] = null
list[2] = null
list[3] = gameobject4

etc etc.

This is driving me crazy and I wasted too many hours trying to figure out what is going on

 

Do the prefabs that you're instantiating have any scripts on it that call 'Destory(gameObject)' on themselves under some condition in its Awake/OnEnable messages?

 

Oh my god, you are absolutely right. One of the scripts in the prefabs had a singleton pattern. I can't believe I did not notice this.

Thank you so much, really.