Confusing Object reference not set error

Unity Engine
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1

I have this error, couldnt get my head around it. Any help appreciated:
Base Class:

namespace TOZ {
	public abstract class ScriptableObjectBase<T> : ScriptableObject {
		protected List<T> Data;

		protected virtual void Awake() {
			if(Data == null) {
				Data = new List<T>();
			}
		}

		public T this[int i] {
			get { return Data[i]; } set { Data[i] = value; }
		}

		public int Count() {
			return Data.Count;
		}
	}
}

Child class

namespace TOZ {
	[CreateAssetMenu(fileName = "data", menuName = "TOZ/SO_Vector3", order = 1)]
	public sealed class SO_Vector3 : ScriptableObjectBase<Vector3> {

	}
}

Editor script:

namespace TOZEditor {
	[CustomEditor(typeof(SO_Vector3))]
	public sealed class CE_SO_Vector3 : Editor {
		private SO_Vector3 obj;

		private void OnEnable() {
			obj = (SO_Vector3)target;
		}

		public override void OnInspectorGUI() {
			int count = obj.Count();
			for(int i = 0; i < count; i++) {
				obj[i] = EditorGUILayout.Vector3Field("Index: " + i, obj[i]);
			}
		}
	}
}

editor script gives an error on for loop while the previous line doesnt. Whats wrong here?

2

Okay, nevermind. The error is caused by the attribute

[CreateAssetMenu(fileName = "data", menuName = "TOZ/SO_Vector3", order = 1)]

This attribute creates, selects and waits for renaming and meanwhile the inspector is trying to get the reference which is somehow not there yet, because of the renaming.

Solution: use the following:

[MenuItem("Assets/Create/TOZ/SO_Vector3")]