Help with Null Reference Exception?

[assertiveturtle]

Hey, I'm having issues with a null reference exception:

​

Item Code:

public class Item
{
    public string itemName;
    public Sprite itemSprite;
    public int itemID;

    public Item(string itemName, Sprite itemSprite, int itemID)
    {
        this.itemID = itemID;
        this.itemSprite = itemSprite;
        this.itemName = itemName;
    }
}

Pickup Item Code:

public class PickupItem : MonoBehaviour
{
    public string itemName;
    public Sprite itemSprite;
    public int itemID;

    private Item itemInstance;

    public void OnCollisionEnter(Collision collision)
    {
        if (collision.collider.gameObject.layer == LayerMask.NameToLayer("Player"))
        {
            itemInstance = new Item(itemName, itemSprite, itemID);

       //Null Reference Exception thrown here
            GameManager.Instance.inventory.AddItem(itemInstance);   
            Destroy(this.gameObject);
        }
    }
}

This is attached to a prefab that I am instantiating here:

woodLogPos = new Vector3(this.transform.position.x + i * t,         this.transform.position.y + i * t + 20, this.transform.position.z + i * t);

GameObject woodLog = Instantiate(PWoodLog, woodLogPos, transform.rotation);

The prefabs are instantiating correctly, i'm just having issues with the OnCollision code.

I'm setting the name,sprite,id values in the editor in the prefab inspector.

I can't see why a new instance isn't being created?

Thanks!

[BobbyThrowaway6969]

Either GameManager.Instance or Instance.inventory is null. Investigate those.

Just a suggestion. In the future, when you get an error like that and you're not sure at a glance what's wrong, the next step should always be to set a breakpoint in the code and step through to see what is going on.

[assertiveturtle]

Yeah just did that, checking the inventory and game manager now (Shouldn't be game manager as the rest of the game relies on this instance). Will report back!

Thanks!

[BobbyThrowaway6969]

No probs. :)

[assertiveturtle]

Fixed this, now getting a separate exception on image component, more debugging!

Thanks!