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Question by Capricornum · Oct 06, 2020 at 10:17 AM · editorerror messagescriptableobjectdestroyimmediate

How to avoid error message when using DestroyImmediate in Editor

I have created a Singleton pattern for ScriptableObjects. Whenever I have a scriptableObject that I only want 1 instance of I let it inherit from my SingletonSO class. See here:

 public class SingletonSO : ScriptableObject
 {
     private void Awake()
     {
         string myTypeString = "t:" + this.GetType().ToString();
         string[] guids = UnityEditor.AssetDatabase.FindAssets(myTypeString);
         if (guids.Length > 0)
         {
             DestroyImmediate(this);
         }
     }
 }

However I receive an error message when the DestroyImmediate method occurs:

NullReferenceException: Object reference not set to an instance of an object UnityEditor.ProjectWindowUtil.CreateAsset (UnityEngine.Object asset, System.String pathName) (at :0)

Is there any way to tell the UnityEditor.ProjectWindowUtil that I have destroyed the object and it should not process it anymore?

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