Weird Null Reference at beginning

Hey everyone. Since updating to Unity 2021.3.16 I receive following 3 exceptions at the start of playmode. They only occur once at the startup. I don't know what this is, neither how to fix it.

They are not from my code, at least I can't find something in the stack trace, that points to a plugin, package or asset.

Has Anyone any suggestions on what could be the cause of this?

thx

NullReferenceException: Object reference not set to an instance of an object

UnityEditor.SceneView.CallOnPreSceneGUI () (at /Users/bokken/build/output/unity/unity/Editor/Mono/SceneView/SceneView.cs:3693)

UnityEditor.SceneView.DoOnPreSceneGUICallbacks (UnityEngine.Rect cameraRect) (at /Users/bokken/build/output/unity/unity/Editor/Mono/SceneView/SceneView.cs:2248)

UnityEditor.SceneView.DoOnGUI () (at /Users/bokken/build/output/unity/unity/Editor/Mono/SceneView/SceneView.cs:2330)

UnityEditor.SceneView.OnSceneGUI () (at /Users/bokken/build/output/unity/unity/Editor/Mono/SceneView/SceneView.cs:2255)

UnityEngine.UIElements.IMGUIContainer.DoOnGUI (UnityEngine.Event evt, UnityEngine.Matrix4x4 parentTransform, UnityEngine.Rect clippingRect, System.Boolean isComputingLayout, UnityEngine.Rect layoutSize, System.Action onGUIHandler, System.Boolean canAffectFocus) (at /Users/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Core/IMGUIContainer.cs:351)

UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr, Boolean&) (at /Users/bokken/build/output/unity/unity/Modules/IMGUI/GUIUtility.cs:189)

GUI Error: You are pushing more GUIClips than you are popping. Make sure they are balanced.

UnityEngine.GUIUtility:ProcessEvent (int,intptr,bool&) (at /Users/bokken/build/output/unity/unity/Modules/IMGUI/GUIUtility.cs:189)

NullReferenceException: Object reference not set to an instance of an object

UnityEditor.SceneView.CallOnPreSceneGUI () (at /Users/bokken/build/output/unity/unity/Editor/Mono/SceneView/SceneView.cs:3693)

UnityEditor.SceneView.DoOnPreSceneGUICallbacks (UnityEngine.Rect cameraRect) (at /Users/bokken/build/output/unity/unity/Editor/Mono/SceneView/SceneView.cs:2248)

UnityEditor.SceneView.DoOnGUI () (at /Users/bokken/build/output/unity/unity/Editor/Mono/SceneView/SceneView.cs:2330)

UnityEditor.SceneView.OnSceneGUI () (at /Users/bokken/build/output/unity/unity/Editor/Mono/SceneView/SceneView.cs:2255)

UnityEngine.UIElements.IMGUIContainer.DoOnGUI (UnityEngine.Event evt, UnityEngine.Matrix4x4 parentTransform, UnityEngine.Rect clippingRect, System.Boolean isComputingLayout, UnityEngine.Rect layoutSize, System.Action onGUIHandler, System.Boolean canAffectFocus) (at /Users/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Core/IMGUIContainer.cs:372)

UnityEngine.UIElements.IMGUIContainer.HandleIMGUIEvent (UnityEngine.Event e, UnityEngine.Matrix4x4 worldTransform, UnityEngine.Rect clippingRect, System.Action onGUIHandler, System.Boolean canAffectFocus) (at /Users/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Core/IMGUIContainer.cs:693)

UnityEngine.UIElements.IMGUIContainer.HandleIMGUIEvent (UnityEngine.Event e, System.Action onGUIHandler, System.Boolean canAffectFocus) (at /Users/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Core/IMGUIContainer.cs:665)

UnityEngine.UIElements.IMGUIContainer.HandleIMGUIEvent (UnityEngine.Event e, System.Boolean canAffectFocus) (at /Users/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Core/IMGUIContainer.cs:658)

UnityEngine.UIElements.IMGUIContainer.SendEventToIMGUIRaw (UnityEngine.UIElements.EventBase evt, System.Boolean canAffectFocus, System.Boolean verifyBounds) (at /Users/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Core/IMGUIContainer.cs:618)

UnityEngine.UIElements.IMGUIContainer.SendEventToIMGUI (UnityEngine.UIElements.EventBase evt, System.Boolean canAffectFocus, System.Boolean verifyBounds) (at /Users/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Core/IMGUIContainer.cs:607)

UnityEngine.UIElements.IMGUIContainer.HandleEvent (UnityEngine.UIElements.EventBase evt) (at /Users/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Core/IMGUIContainer.cs:535)

UnityEngine.UIElements.CallbackEventHandler.HandleEventAtTargetPhase (UnityEngine.UIElements.EventBase evt) (at /Users/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Core/Events/EventHandler.cs:151)

UnityEngine.UIElements.EventDispatchUtilities.PropagateEvent (UnityEngine.UIElements.EventBase evt) (at /Users/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Core/Events/IEventDispatchingStrategy.cs:74)

UnityEngine.UIElements.MouseEventDispatchingStrategy.SendEventToRegularTarget (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.BaseVisualElementPanel panel) (at /Users/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Core/Events/MouseEventDispatchingStrategy.cs:35)

UnityEngine.UIElements.MouseEventDispatchingStrategy.SendEventToTarget (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.BaseVisualElementPanel panel) (at /Users/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Core/Events/MouseEventDispatchingStrategy.cs:26)

UnityEngine.UIElements.MouseEventDispatchingStrategy.DispatchEvent (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel iPanel) (at /Users/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Core/Events/MouseEventDispatchingStrategy.cs:19)

UnityEngine.UIElements.EventDispatcher.ApplyDispatchingStrategies (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel, System.Boolean imguiEventIsInitiallyUsed) (at /Users/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Core/EventDispatcher.cs:381)

UnityEngine.UIElements.EventDispatcher.ProcessEvent (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel) (at /Users/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Core/EventDispatcher.cs:344)

UnityEngine.UIElements.EventDispatcher.Dispatch (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel, UnityEngine.UIElements.DispatchMode dispatchMode) (at /Users/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Core/EventDispatcher.cs:222)

UnityEngine.UIElements.BaseVisualElementPanel.SendEvent (UnityEngine.UIElements.EventBase e, UnityEngine.UIElements.DispatchMode dispatchMode) (at /Users/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Core/Panel.cs:420)

UnityEngine.UIElements.UIElementsUtility.DoDispatch (UnityEngine.UIElements.BaseVisualElementPanel panel) (at /Users/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Core/UIElementsUtility.cs:468)

UnityEngine.UIElements.UIElementsUtility.UnityEngine.UIElements.IUIElementsUtility.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr, System.Boolean& eventHandled) (at /Users/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Core/UIElementsUtility.cs:211)

UnityEngine.UIElements.UIEventRegistration.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr) (at /Users/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Core/UIElementsUtility.cs:74)

UnityEngine.UIElements.UIEventRegistration+<>c.<.cctor>b__1_2 (System.Int32 i, System.IntPtr ptr) (at /Users/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Core/UIElementsUtility.cs:28)

UnityEngine.GUIUtility.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr, System.Boolean& result) (at /Users/bokken/build/output/unity/unity/Modules/IMGUI/GUIUtility.cs:189)

 

Sometimes with sceneview-related errors, I can get them to stop appearing by resetting to one of the default window layouts. Choose whichever one is closest to what you already have.

 

As of right now, It seems, what you suggested fixed it. Thanks, I'll keep this in mind. Resetting the Layout

 

Sadly still happens a lot, seems not to be fixed