diff --git a/Editor/LTCGI_Controller.cs b/Editor/LTCGI_Controller.cs
index affa12b..7f41bde 100644
--- a/Editor/LTCGI_Controller.cs
+++ b/Editor/LTCGI_Controller.cs
@@ -148,7 +148,11 @@ public void UpdateMaterials(bool fast, LTCGI_Screen screen = null)
                 return;
             if (Lightmapping.isRunning)
                 return;
-            if (UnityEngine.SceneManagement.SceneManager.loadedSceneCount == 0)
+            #if UNITY_2022_1_OR_NEWER
+                if (UnityEngine.SceneManagement.SceneManager.loadedSceneCount == 0)
+            #else
+                if (UnityEditor.SceneManagement.EditorSceneManager.loadedSceneCount == 0)
+            #endif
                 return;
 
             #if DEBUG_LOG