m_InstanceID == 0, what does it mean?

Does anyone know what the error "m_InstanceID == 0" in the editor log is about? It happens when loading scenes on my current project, but doesn't appear to have any effect on the game at the moment.

However, I'm trying to keep my project error and warning free, so any information would be appreciated.

If I recall correctly, I got this error out of the blue at one point some months ago. There was no particular explanation, and re-importing everything at the top of the project made it go away. There was no ill effect other than the error message showing up constantly.

Please do comment if that were the case, as it was a one-off problem some time ago and my memory might be faulty.