Исправление. "null reference"

scenes/button-flat/nine-patch-button.gd

@@ -11,48 +11,54 @@ func is_toggle_mode(): return $button.is_toggle_mode()
 
 
 @export var texture_state0: Texture2D = preload('res://data/кнопка-квадрат-0.png'):
-    set(val): $state.set_texture(val)
+    set(val):
+        texture_state0 = val
+        if is_inside_tree():
+            $state.set_texture(val)
 
 
 @export var texture_state1: Texture2D = preload('res://data/кнопка-квадрат-1.png'):
-    set(val): $state.set_texture(val)
+    set(val):
+        texture_state1 = val
+        if is_inside_tree():
+            $state.set_texture(val)
 
 
 @export var strips_rotation: float = 0.0:
     set(val):
         strips_rotation = val
-        $back.strips_rotation = deg_to_rad(val)
-    get: return strips_rotation
+        if is_inside_tree():
+            $back.strips_rotation = deg_to_rad(val)
 
 
 @export var text: String = '':
-    set(val): $button.set_text(val)
-    get: return $button.get_text()
+    set(val):
+        text = val
+        if is_inside_tree():
+            $button.set_text(val)
 
 
 @export var disabled: bool = false:
     set(val):
         disabled = val
-        $button.set_disabled(val)
-        $back.disabled = val
-        $state.modulate.a = 0.5 if val else 1.0
-    get: return disabled
+        if is_inside_tree():
+            $button.set_disabled(val)
+            $back.disabled = val
+            $state.modulate.a = 0.5 if val else 1.0
 
 
 @export var pressed: bool = false:
     set(val):
         pressed = val
-        $button.set_pressed(val)
-    get:
-        return pressed
+        if is_inside_tree():
+            $button.set_pressed(val)
 
 
 @export var toggle_mode: bool = false:
     set(val):
         toggle_mode = val
-        $button.set_toggle_mode(val)
-    get:
-        return toggle_mode
+        if is_inside_tree():
+            $button.set_toggle_mode(val)
 
 
 func button_connect(button_signal: String, proc: Callable):

scenes/cell/cell-front.gd

@@ -1,5 +1,7 @@
 extends Control
 
 @export var text: String = '':
-    set(val): $label.set_text(val)
-    get: return $label.get_text()
+    set(val):
+        text = val
+        if is_inside_tree():
+            $label.set_text(val)