Steps to reproduce:
1. Open project attached below.
2. Navigate to: Projects->Scenes and open scene named "Cemetery".
3. In the "Hierarchy" window try selecting game object named "main".

Actual result:
Unity crashes and "Unity Bug Reporter" window appears.

Expected result:
Unity should not crash when trying to select a specific game object.

4. Open the same project again.
5. Navigate to: Project->Editor and open script named "MainEditor".
6. Find this line of code, temporary delete it and save changes:

"element.FindPropertyRelative("NotUsed").serializedObject.GetIterator().intValue = index;"

7. Try selecting game object named "main" and notice that Unity does not crash anymore.
8. Undo deleting that line of code, save changes and repeat the third step.
9. Notice that the issue is again reproducible.

Reproduced with:
5.3.4f1, 5.3.4p6, 5.3.5f1, 5.4.0b18.

Cannot reproduce with:
5.1.0f3, 5.2.4f1, because "SceneManagment" was not supported.