Prevent crash when launching frog minigame

sources/minigames/frog/frog_minigame.gd

@@ -1,7 +1,9 @@
 class_name FrogMinigame
 extends WordsMinigame
 
-const LILYPAD_TRACK_SCENE: PackedScene = preload("res://sources/minigames/frog/lilypad_track.tscn")
+const RIVER_SCENE_PATH: String = "res://sources/minigames/frog/river.tscn"
+const FROG_SCENE_PATH: String = "res://sources/minigames/frog/frog.tscn"
+const LILYPAD_TRACK_SCENE_PATH: String = "res://sources/minigames/frog/lilypad_track.tscn"
 
 var difficulty_settings: Array[DifficultySettings] = [
 	DifficultySettings.new(0.75, 100., 200.),
@@ -10,14 +12,52 @@ var difficulty_settings: Array[DifficultySettings] = [
 	DifficultySettings.new(0.25, 250., 350.),
 	DifficultySettings.new(0.25, 300., 400.)
 ]
+var river: River
+var frog: Frog
+var lilypad_track_scene: PackedScene
 
 @onready var start: Control = %Start
 @onready var end: Control = %End
 @onready var frog_spawn_point: Control = %FrogSpawnPoint
 @onready var frog_despawn_point: Control = %FrogDespawnPoint
-@onready var river: River = $GameRoot/Background/River
 @onready var lilypad_tracks_container: HBoxContainer = %LilypadTracksContainer
-@onready var frog: Frog = %Frog
+
+
+func _setup_minigame() -> void:
+	super()
+	await _instantiate_subscenes()
+
+
+func _instantiate_subscenes() -> void:
+	var background_node: Control = $GameRoot/Background
+	var game_root_node: Control = $GameRoot
+
+	await get_tree().process_frame
+	if not is_inside_tree():
+		return
+
+	river = (load(RIVER_SCENE_PATH) as PackedScene).instantiate()
+	river.name = "River"
+	background_node.add_child(river)
+	background_node.move_child(river, 0)
+
+	await get_tree().process_frame
+	if not is_inside_tree():
+		return
+
+	frog = (load(FROG_SCENE_PATH) as PackedScene).instantiate()
+	frog.name = "Frog"
+	frog.offset_left = 360.0
+	frog.offset_top = 900.0
+	frog.offset_right = 360.0
+	frog.offset_bottom = 900.0
+	game_root_node.add_child(frog)
+
+	await get_tree().process_frame
+	if not is_inside_tree():
+		return
+
+	lilypad_track_scene = load(LILYPAD_TRACK_SCENE_PATH) as PackedScene
 
 
 func _setup_word_progression() -> void:
@@ -65,7 +105,7 @@ func _create_tracks() -> void:
 	var current_word: Dictionary = _get_current_stimulus()
 	var current_distractors: Array = _get_current_distractors()
 	for index: int in range((current_word.GPs as Array).size()):
-		var track: LilypadTrack = LILYPAD_TRACK_SCENE.instantiate()
+		var track: LilypadTrack = lilypad_track_scene.instantiate()
 		lilypad_tracks_container.add_child(track)
 		track.difficulty_settings = difficulty_settings[difficulty]
 		track.gp = current_word.GPs[index]

sources/minigames/frog/frog_minigame.tscn

@@ -4,9 +4,7 @@
 [ext_resource type="Script" uid="uid://b7q0v031ffg1v" path="res://sources/minigames/frog/frog_minigame.gd" id="2_0xg3r"]
 [ext_resource type="Texture2D" uid="uid://jvpu77isfi5b" path="res://assets/minigames/frog/graphics/gauge_icon_frog_empty.png" id="2_e38i1"]
 [ext_resource type="Texture2D" uid="uid://re7qgivb3n5w" path="res://assets/minigames/frog/graphics/gauge_icon_frog_full.png" id="3_vjlmb"]
-[ext_resource type="PackedScene" uid="uid://sumrd1i3g6f7" path="res://sources/minigames/frog/river.tscn" id="5_3fy8q"]
 [ext_resource type="Texture2D" uid="uid://bgi4vveige3qv" path="res://assets/minigames/frog/graphics/background.png" id="6_t6p6q"]
-[ext_resource type="PackedScene" uid="uid://bloyucpsbvpx8" path="res://sources/minigames/frog/frog.tscn" id="13_o6mls"]
 
 [node name="FrogMinigame" unique_id=37863016 instance=ExtResource("1_ng5er")]
 script = ExtResource("2_0xg3r")
@@ -32,10 +30,7 @@ grow_horizontal = 2
 grow_vertical = 2
 mouse_filter = 2
 
-[node name="River" parent="GameRoot/Background" index="0" unique_id=1451318535 instance=ExtResource("5_3fy8q")]
-layout_mode = 1
-
-[node name="background" type="TextureRect" parent="GameRoot/Background" index="1" unique_id=1762725401]
+[node name="background" type="TextureRect" parent="GameRoot/Background" index="0" unique_id=1762725401]
 layout_mode = 1
 anchors_preset = 11
 anchor_left = 1.0
@@ -99,11 +94,3 @@ offset_bottom = 250.0
 grow_horizontal = 2
 grow_vertical = 2
 alignment = 1
-
-[node name="Frog" parent="GameRoot" parent_id_path=PackedInt32Array(1053321881) index="3" unique_id=1044684229 instance=ExtResource("13_o6mls")]
-unique_name_in_owner = true
-layout_mode = 0
-offset_left = 360.0
-offset_top = 900.0
-offset_right = 360.0
-offset_bottom = 900.0

sources/minigames/frog/lilypad_track.gd

@@ -3,7 +3,9 @@ extends Control
 
 signal lilypad_in_center(lilypad: Lilypad)
 
-const LILYPAD_SCENE: PackedScene = preload("res://sources/minigames/frog/lilypad.tscn")
+const LILYPAD_SCENE_PATH: String = "res://sources/minigames/frog/lilypad.tscn"
+
+static var _lilypad_scene: PackedScene
 
 var top_to_bottom: bool = false
 var is_stopped: bool = false
@@ -79,7 +81,9 @@ func pick_distractor() -> Dictionary:
 #region Lilypads
 
 func _spawn_lilypad() -> void:
-	var lilypad: Lilypad = LILYPAD_SCENE.instantiate()
+	if not _lilypad_scene:
+		_lilypad_scene = load(LILYPAD_SCENE_PATH) as PackedScene
+	var lilypad: Lilypad = _lilypad_scene.instantiate()
 	lilypads.append(lilypad)
 	add_child(lilypad)