Reply To: Probable mistake in GraphOwnerInspector.OnDestroy()

[psykaw]

You’re both almost right.
owner == null could return true but owner could be not null (will be destroyed at the end of the frame). == operator is overriden by Unity.

To prevent null ref exception you should replace condition with this code:
owner == null && !ReferenceEquals(owner, null) && owner.graph != null