Editor DockArea:OnGUI() error on GameObject selection

Unity Engine
1

Hi,
I can’t recognise when that error appeared, but all my attempts to find and fix a reason are failed.
Case: I got a character GO with a lot of scripts attached to it. What is strange, each script raise that error. Looks like some kind of bug.
Is there a way to get more info about that error? For example where is problem it self?

The same field name is serialized multiple times in the class or its parent class. This is not supported: Base(MonoBehaviour) m_GameObject
UnityEditor.DockArea:OnGUI()
2

Updated!

That happened ONLY when I used 2 Inspector windows (1st on main display, 2nd on extended monitor) and not all the time. Looks like on layout loading only. Weird…