ArgumentNullException: Value cannot be null. when pressing play in empty project

I get this errors on Unity beta 2018.3.b2 on a Mac
The project is new and empty, when pressing play it returns after clearing in the console.

Restarting unity does not help, deleting library folder also does not help

Spoiler: Error 1

ArgumentNullException: Value cannot be null.
Parameter name: key
System.Collections.Generic.Dictionary`2[TKey,TValue].FindEntry (TKey key) (at <ac823e2bb42b41bda67924a45a0173c3>:0)
System.Collections.Generic.Dictionary`2[TKey,TValue].TryGetValue (TKey key, TValue& value) (at <ac823e2bb42b41bda67924a45a0173c3>:0)
Unity.Experimental.EditorMode.EditorModes.ShouldInvokeOnGUI (UnityEditor.EditorWindow window) (at /Users/builduser/buildslave/unity/build/Editor/Mono/EditorMode/EditorModes.cs:301)
UnityEditor.HostView.OldOnGUI () (at /Users/builduser/buildslave/unity/build/Editor/Mono/HostView.cs:125)
UnityEngine.Experimental.UIElements.IMGUIContainer.DoOnGUI (UnityEngine.Event evt, UnityEngine.Matrix4x4 worldTransform, UnityEngine.Rect clippingRect, System.Boolean isComputingLayout) (at /Users/builduser/buildslave/unity/build/Modules/UIElements/IMGUIContainer.cs:244)
UnityEngine.GUIUtilityrocessEvent(Int32, IntPtr)

Spoiler: Error 2

ArgumentNullException: Value cannot be null.
Parameter name: key
System.Collections.Generic.Dictionary`2[TKey,TValue].FindEntry (TKey key) (at <ac823e2bb42b41bda67924a45a0173c3>:0)
System.Collections.Generic.Dictionary`2[TKey,TValue].TryGetValue (TKey key, TValue& value) (at <ac823e2bb42b41bda67924a45a0173c3>:0)
Unity.Experimental.EditorMode.EditorModes.ShouldInvokeOnGUI (UnityEditor.EditorWindow window) (at /Users/builduser/buildslave/unity/build/Editor/Mono/EditorMode/EditorModes.cs:301)
UnityEditor.HostView.OldOnGUI () (at /Users/builduser/buildslave/unity/build/Editor/Mono/HostView.cs:125)
UnityEngine.Experimental.UIElements.IMGUIContainer.DoOnGUI (UnityEngine.Event evt, UnityEngine.Matrix4x4 worldTransform, UnityEngine.Rect clippingRect, System.Boolean isComputingLayout) (at /Users/builduser/buildslave/unity/build/Modules/UIElements/IMGUIContainer.cs:266)
UnityEngine.Experimental.UIElements.IMGUIContainer.HandleIMGUIEvent (UnityEngine.Event e, UnityEngine.Matrix4x4 worldTransform, UnityEngine.Rect clippingRect) (at /Users/builduser/buildslave/unity/build/Modules/UIElements/IMGUIContainer.cs:438)
UnityEngine.Experimental.UIElements.IMGUIContainer.HandleIMGUIEvent () (at /Users/builduser/buildslave/unity/build/Modules/UIElements/IMGUIContainer.cs:412)
UnityEngine.Experimental.UIElements.ImmediateStylePainter.DrawImmediate (System.Action callback) (at /Users/builduser/buildslave/unity/build/Modules/UIElements/ImmediateStylePainter.cs:113)
UnityEngine.Experimental.UIElements.IMGUIContainer.DoRepaint (UnityEngine.Experimental.UIElements.IStylePainter painter) (at /Users/builduser/buildslave/unity/build/Modules/UIElements/IMGUIContainer.cs:98)
UnityEngine.Experimental.UIElements.VisualElement.Repaint (UnityEngine.Experimental.UIElements.IStylePainter painter) (at /Users/builduser/buildslave/unity/build/Modules/UIElements/VisualElement.cs:829)
UnityEngine.Experimental.UIElements.VisualTreeRepaintUpdater.PaintSubTree (UnityEngine.Experimental.UIElements.VisualElement root, UnityEngine.Matrix4x4 offset, System.Boolean shouldClip, System.Boolean shouldCache, UnityEngine.Rect currentGlobalClip) (at /Users/builduser/buildslave/unity/build/Modules/UIElements/VisualTreeRepaintUpdater.cs:310)
UnityEngine.Experimental.UIElements.VisualTreeRepaintUpdater.PaintSubTreeChildren (UnityEngine.Experimental.UIElements.VisualElement root, UnityEngine.Matrix4x4 offset, System.Boolean shouldClip, System.Boolean shouldCache, UnityEngine.Rect textureClip) (at /Users/builduser/buildslave/unity/build/Modules/UIElements/VisualTreeRepaintUpdater.cs:328)
UnityEngine.Experimental.UIElements.VisualTreeRepaintUpdater.PaintSubTree (UnityEngine.Experimental.UIElements.VisualElement root, UnityEngine.Matrix4x4 offset, System.Boolean shouldClip, System.Boolean shouldCache, UnityEngine.Rect currentGlobalClip) (at /Users/builduser/buildslave/unity/build/Modules/UIElements/VisualTreeRepaintUpdater.cs:314)
UnityEngine.Experimental.UIElements.VisualTreeRepaintUpdater.Update () (at /Users/builduser/buildslave/unity/build/Modules/UIElements/VisualTreeRepaintUpdater.cs:35)
UnityEngine.Experimental.UIElements.VisualTreeUpdater.UpdateVisualTree () (at /Users/builduser/buildslave/unity/build/Modules/UIElements/VisualTreeUpdater.cs:70)
UnityEngine.Experimental.UIElements.Panel.Repaint (UnityEngine.Event e) (at /Users/builduser/buildslave/unity/build/Modules/UIElements/Panel.cs:507)
UnityEngine.Experimental.UIElements.UIElementsUtility.DoDispatch (UnityEngine.Experimental.UIElements.BaseVisualElementPanel panel) (at /Users/builduser/buildslave/unity/build/Modules/UIElements/UIElementsUtility.cs:230)
UnityEngine.Experimental.UIElements.UIElementsUtility.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr) (at /Users/builduser/buildslave/unity/build/Modules/UIElements/UIElementsUtility.cs:68)
UnityEngine.GUIUtility.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr) (at /Users/builduser/buildslave/unity/build/Modules/IMGUI/GUIUtility.cs:179)

 

Thanks, Submitted the report Case (1085012)

 

Ok I found the solution I had to reset the editor layout!
Now the errors are gone.