Don't know why my code is failing at this line

[Gyrosupernova]

Godot Version

V4.3.stable

Question

I do not know why my code is failing at line 26 here saying that MeshNode is Nil.

@tool
extends Node3D
class_name TerrainNode

enum TerrainType {NORMAL_TERRAIN, ROUGH_TERRAIN, WATER_TERRAIN, POISON_TERRAIN, LAVA_TERRAIN}
@export var CurrentTerrain = TerrainType.NORMAL_TERRAIN
@export var TerrainMesh = load("res://Scenes/Primary/TerrainBlocks/PlaceHolder/PHTerrainNormal1.tscn"):
	get:
		return TerrainMesh
	set(Mesh):
		TerrainMesh = Mesh
		UpdateMesh()

@onready var MeshNode  = $PhTerrainNormal2

# Called when the node enters the scene tree for the first time.
func _ready() -> void:
	pass

# Called every frame. 'delta' is the elapsed time since the previous frame.
func _process(delta: float) -> void:
	pass

func UpdateMesh() -> void:
	var NewMesh = TerrainMesh.instantiate()
	MeshNode.queue_free()
	MeshNode = NewMesh
	add_child(MeshNode)

[gertkeno]

Maybe you should only call UpdateMesh if it is not set to null

set(Mesh):
	TerrainMesh = Mesh
	if MeshNode:
		UpdateMesh()

[Gyrosupernova]

That didn’t change anything unfortunately, same error in the same place. MeshNode specifically will not let me queue_free().

[gertkeno]

You must be calling UpdateMesh elsewhere too then.

You could add a similar check to the function itself

func UpdateMesh() -> void:
	var NewMesh = TerrainMesh.instantiate()
	if MeshNode:
		MeshNode.queue_free()
	MeshNode = NewMesh
	add_child(MeshNode)

[BadgerCopter]

export is called after onready, so when youre referencing an onready var from an export, the export var doesnt exist yet. at least thats what i can tell at a glance

[Gyrosupernova]

This will stop the error, but will not allow me to queue_free the old mesh node. The whole idea is to have a way to quick swap out the mesh node being used in this scene.

[Gyrosupernova]

I finally got it. I set up the node to make it spawn the mesh node itself instead of grabbing the one that is placed there in editor. Using this it works naturally.