If you have an object with UI components as a prefab and attempt to override a property of the UI component by right clicking in the Inspector and selecting apply, a NullReferenceException will occur. Note that this doesn't happen when applying changes via the Overrides dropdown.

NullReferenceException: SerializedObject of SerializedProperty has been Disposed.
UnityEditor.SerializedProperty.Verify (VerifyFlags verifyFlags) (at C:/buildslave/unity/build/Editor/Mono/SerializedProperty.bindings.cs:322)
UnityEditor.SerializedProperty.get_propertyPath () (at C:/buildslave/unity/build/Editor/Mono/SerializedProperty.bindings.cs:497)
UnityEditor.PrefabUtility.ApplyPrefabPropertyOverride (UnityEditor.SerializedProperty instanceProperty, System.String assetPath, InteractionMode action, Boolean singlePropertyOnly) (at C:/buildslave/unity/build/Editor/Mono/Prefabs/PrefabUtility.cs:455)
UnityEditor.PrefabUtility.ApplyPrefabPropertyOverride (UnityEditor.SerializedProperty instanceProperty, System.String assetPath, InteractionMode action) (at C:/buildslave/unity/build/Editor/Mono/Prefabs/PrefabUtility.cs:391)
UnityEditor.TargetChoiceHandler.ApplyPrefabPropertyOverride (System.Object userData) (at C:/buildslave/unity/build/Editor/Mono/GUI/TargetChoiceHandler.cs:57)
UnityEditor.GenericMenu.CatchMenu (System.Object userData, System.String[] options, Int32 selected) (at C:/buildslave/unity/build/Editor/Mono/GUI/GenericMenu.cs:119)

1. Install Unity
2. Open the attached project
3. Open TestScene.scene
4. Select "Image" from the Scene Hierarchy
5. Change any property on the Image Component
6. Right click on the name of the changed property in the Inspector and apply the overrides.

Result:
A NullRef occurs.

Expected Result:
The override should be applied correctly with no errors or exceptions.