Steps to reproduce:
1. Open the attached project.
2. Open scene 'Test'.
3. In the Hierarchy press 'Test_ShowFPS'

When the object is selected, in the console it displays an error:

InvalidOperationException: The operation is not possible when moved past all properties (Next returned false)
UnityEditor.PropertyHandlerCache.GetPropertyHash (UnityEditor.SerializedProperty property) (at /Users/builduser/buildslave/unity/build/Editor/Mono/Inspector/PropertyDrawerCache.cs:31)

The user uses a plugin called uScript from the asset store.

Reproduced on:
5.4.0b23, 5.4.0b22, 5.4.0b21.

Did not reproduce on:
5.4.0b20, 5.4.0b18, 5.4.0b17, 5.3.5p3.