(Case 1081625) Scene view suddenly become grey

Not really sure the root cause of the problem but before that I'm trying to modify and duplicate prefab. Modifying prefab keep failing that I'm not able to change the component of the prefab and duplicate the prefab to modify it also same result.

Here's the errors I get:

Spoiler

NullReferenceException: Object reference not set to an instance of an object
UnityEditor.SceneHierarchyStageHandling.SyncHierarchyToCurrentStage (UnityEditor.SceneManagement.StageNavigationItem stage, Boolean loadExpandedState) (at C:/buildslave/unity/build/Editor/Mono/SceneHierarchyStageHandling.cs:92)
UnityEditor.SceneHierarchyStageHandling.OnEnable () (at C:/buildslave/unity/build/Editor/Mono/SceneHierarchyStageHandling.cs:48)
UnityEditor.SceneHierarchyWindow.OnEnable () (at C:/buildslave/unity/build/Editor/Mono/SceneHierarchyWindow.cs:64)

Spoiler

NullReferenceException: Object reference not set to an instance of an object
UnityEditor.SceneHierarchyStageHandling.PrefabStageHeaderGUI (Rect rect) (at C:/buildslave/unity/build/Editor/Mono/SceneHierarchyStageHandling.cs:253)
UnityEditor.SceneHierarchyWindow.DoSceneHierarchy () (at C:/buildslave/unity/build/Editor/Mono/SceneHierarchyWindow.cs:147)
UnityEditor.SceneHierarchyWindow.OnGUI () (at C:/buildslave/unity/build/Editor/Mono/SceneHierarchyWindow.cs:133)
System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Reflection/MonoMethod.cs:222)
Rethrow as TargetInvocationException: Exception has been thrown by the target of an invocation.
System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Reflection/MonoMethod.cs:232)
System.Reflection.MethodBase.Invoke (System.Object obj, System.Object[] parameters) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Reflection/MethodBase.cs:115)
UnityEditor.HostView.Invoke (System.String methodName, System.Object obj) (at C:/buildslave/unity/build/Editor/Mono/HostView.cs:335)
UnityEditor.HostView.Invoke (System.String methodName) (at C:/buildslave/unity/build/Editor/Mono/HostView.cs:329)
UnityEditor.HostView.InvokeOnGUI (Rect onGUIPosition, Rect viewRect) (at C:/buildslave/unity/build/Editor/Mono/HostView.cs:295)
UnityEngine.GUIUtilityrocessEvent(Int32, IntPtr)

Spoiler

NullReferenceException: Object reference not set to an instance of an object
UnityEditor.SceneViewStageHandling.AutoSaveButtons () (at C:/buildslave/unity/build/Editor/Mono/SceneView/SceneViewStageHandling.cs:241)
UnityEditor.SceneViewStageHandling.BreadcrumbGUI () (at C:/buildslave/unity/build/Editor/Mono/SceneView/SceneViewStageHandling.cs:219)
UnityEditor.SceneView.DoToolbarGUI () (at C:/buildslave/unity/build/Editor/Mono/SceneView/SceneView.cs:851)
UnityEditor.SceneView.OnGUI () (at C:/buildslave/unity/build/Editor/Mono/SceneView/SceneView.cs:1829)
System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Reflection/MonoMethod.cs:222)
Rethrow as TargetInvocationException: Exception has been thrown by the target of an invocation.
System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Reflection/MonoMethod.cs:232)
System.Reflection.MethodBase.Invoke (System.Object obj, System.Object[] parameters) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Reflection/MethodBase.cs:115)
UnityEditor.HostView.Invoke (System.String methodName, System.Object obj) (at C:/buildslave/unity/build/Editor/Mono/HostView.cs:335)
UnityEditor.HostView.Invoke (System.String methodName) (at C:/buildslave/unity/build/Editor/Mono/HostView.cs:329)
UnityEditor.HostView.InvokeOnGUI (Rect onGUIPosition, Rect viewRect) (at C:/buildslave/unity/build/Editor/Mono/HostView.cs:295)
UnityEngine.GUIUtilityrocessEvent(Int32, IntPtr)