Null Reference exception when finding path

[Maksym]

Please help! I have Null Reference exception - tried to debug, seems like Pathfinding.FindPath does’nt work properly - put in the end
// No path found
Debug.Log(“You shall not pass!”);
return null;
and it shows me it every time i’m trying to draw line with Null Reference exception

all the code is fine as for me, checked it 3or 4 times, searched that nasty bug everywhere… with my luck that bug is somewhere in prefab))

[bixarrio]

OK, Show us what you have so that we can try to help. Perhaps start with FindPath()

[Maksym]

public List FindPath(GridPosition startPosition, GridPosition endPosition)
{
List openList = new();
List closedList = new();

    PathNode startNode = gridSystem.GetGridObject(startPosition);
    PathNode endNode = gridSystem.GetGridObject(endPosition);
    
    openList.Add(startNode);        

    for (int x = 0; x < gridSystem.GetWidth(); x++)
    {
        for (int z = 0; z < gridSystem.GetHeight(); z++)
        {
            GridPosition gridPosition = new GridPosition(x, z);
            PathNode pathNode = gridSystem.GetGridObject(gridPosition);

            pathNode.SetGCost(int.MaxValue);
            pathNode.SetHCost(0);
            pathNode.CalculateFCost();
            pathNode.ResetPreviousPathNode();
        }
    }

    startNode.SetGCost(0);
    startNode.SetHCost(CalculateDistance(startPosition, endPosition));
    startNode.CalculateFCost();

    while (openList.Count > 0)
    {
        PathNode currentNode = GetLowestFCostNode(openList);

        if (currentNode == endNode)
        {
            return CalculatePath(endNode);
        }

        openList.Remove(currentNode);
        closedList.Add(currentNode);

        foreach (PathNode neighbourNode in GetNeighbourList(currentNode))
        {
            if (closedList.Contains(neighbourNode)) continue;
            
            int tentativeGCost = currentNode.GetGCost() + CalculateDistance(currentNode.GetGridPosition(), neighbourNode.GetGridPosition());

            if (tentativeGCost < neighbourNode.GetGCost())
            {
                neighbourNode.SetPreviousNode(currentNode);
                neighbourNode.SetGCost(tentativeGCost);
                neighbourNode.SetHCost(CalculateDistance(neighbourNode.GetGridPosition(), endPosition));
                neighbourNode.CalculateFCost();

                if (!openList.Contains(neighbourNode)) 
                { 
                    openList.Add(neighbourNode); 
                }
            }

        }
    }
    // No path found
    Debug.Log("You shall not pass!");
    return null;
}

[Maksym]

holly guacamolly!) found that little buggy)
it was sitting in PathNode -

public void SetHCost(int hCost)
{
    this.**g**Cost = hCost;
}

Thanks, #bixarrio

[bixarrio]

Nice. Good find