Update SceneSerializationUtility.cs

Author: Zenodeon

Assets/Editor Toolbox/Runtime/Serialization/SceneSerializationUtility.cs

@@ -43,11 +43,11 @@ private static void RefreshCache()
             var buildIndex = -1;
             foreach (var scene in EditorBuildSettings.scenes)
             {
-                buildIndex++;
-
                 if (string.IsNullOrEmpty(scene.path))
                     continue;
 
+                buildIndex++;
+
                 var sceneIndex = scene.enabled ? buildIndex : InvalidSceneIndex;
                 var sceneAsset = EditorGUIUtility.Load(scene.path) as SceneAsset;
                 if (sceneAsset != null)