I'm trying to build snake

[empty latch]

So far what I have been building has been working fine. But I have no idea where this error is coming from and I don't want it to brick anything later down the line.

I'm planning on using Panel segments as parts of the snake, I haven't gotten to movement or much else yet.

Thanks for all the help
Code

public partial class Main : Node
{
    [Export]
    public PackedScene SnakeScene { get; set; }

    private List<Panel> Snake = new List<Panel>();

    public override void _Ready()
    {
        AddSegment(new Vector2(200, 200));
        GenerateSnake();
        foreach (Panel item in Snake)
        {
            GD.Print(this.ToString());
        }
    }
    public void AddSegment(Vector2 pos)
    {
        Panel test = (Panel)SnakeScene.Instantiate();
        test.Position = pos;
        Snake.Add(test);
        AddChild(test);
    }
    public void GenerateSnake()
    {
        for (int i = 0; i < 3; i++)
        {
            AddSegment(new Vector2(450,450+i*50));
        }
    }
}```
Error
E 0:00:00:813   void Main.AddSegment(Godot.Vector2): System.NullReferenceException: Object reference not set to an instance of an object.
  <C# Error>    System.NullReferenceException
  <C# Source>   Main.cs:37 @ void Main.AddSegment(Godot.Vector2)
  <Stack Trace> Main.cs:37 @ void Main.AddSegment(Godot.Vector2)
                Main.cs:19 @ void Main._Ready()

I'm not sure what is causing the error since everything seems to be working ok

[languid ingot]

you might have accidentally assigned this script to two different nodes and one doesn't have SnakeScene set

but that's just a guess

[empty latch]

Thanks, that was it.

I added a timer node that I wasn't using yet, in the main.cs . It didn't have the SnakeScene.tscn

[languid ingot]

it's a common issue; the tell is "export is null even though it was set in editor" and "everything still seems to work" because one script throwing an error doesn't affect other scripts

[empty latch]

huh, interresting. I thought everything would work out because the timer node wasn't interacting with the panel node at all.