NullReferenceException, can you help please?

Unity Engine
,
1

hello im begginer in C# and unity. i cant assign a boolean value to the IsShieldNull method
it writes that it is null. can you help me pls? i spend 2 days for this problem and cannot fix.
error message - (NullReferenceException: Object reference not set to an instance of an object)
Thanks.

here is my main code.

public class PlayerManager : MonoBehaviour 
{
    public PowerUpShield ShieldPowerUp;

    void Start()
    {
            ShieldPowerUp.GetComponent<PowerUpShield>();
    }

    void FixedUpdate()
    {
        if (ShieldPowerUp.IsShieldNull() == true)
            {
                if (Input.GetKey(KeyCode.C))
                {
                    Shield.SetActive(true);
                }   
            }
    }
}

and my second code from where i want to use variable boolean.

public class PowerUpShield : MonoBehaviour
{
    public GameObject IsPowerUpAnimation;
    public bool IsNull;
   
    void Start()
    {
        IsShieldNull();//tryed to summon method here to assign.. but no result.
        IsNull = false;
    }

    void OnTriggerEnter2D(Collider2D Trig)
    {
        if (Trig.gameObject.tag == "Player")
        {
            IsNull = true;
            Destroy(gameObject);
            IsPowerUpAnimation.SetActive(true);
            Destroy(IsPowerUpAnimation, 1.5f);
            IsShieldNull();//tryed to summon method here to assign.. but no result.
        }
    }

    public bool IsShieldNull()
    {
        return IsNull;
    }
}
2

If the exception is coming from this line (#12 in first code snippet)

        if (ShieldPowerUp.IsShieldNull() == true)

Then it’s not that the bool is null (bools cannot be null), it’s that the reference ShieldPowerUp is null. Therefore, when you try to access its method IsShieldNull() you cannot and so that exception is thrown.

How to fix? It’s likely that you have not assigned an object to the PlayerManager’s field ShieldPowerUp. You may make that assignment in the Inspector by dragging in the ShieldPowerUp instance from your scene’s hierarchy and into PlayerManager’s field for it.

3

omg, Thanks, you’re my saver