*Reproducible on:*
* VS version: 1.7.6
* Unity version: 2021.2.5f1
* Platforms: Windows 10 and macOS Monterrey

*Steps to Reproduce:*
# Create a game object and attach to it a script machine with a script graph
# Create a simple debug graph and put it inside a group.
# Enter play mode
# Stop play mode (Observe that the node group disappear)
# Try to create another node group component

*Outcome Results:*
* When the user tries to create a new group component the following errors appear in the console:
{code:java}
NullReferenceException: Object reference not set to an instance of an object
Unity.VisualScripting.VisualScriptingCanvas`1[TGraph].get_groupArea () (at Library/PackageCache/com.unity.visualscripting@1.7.6/Editor/VisualScripting.Core/Canvases/VisualScriptingCanvas.cs:897)
Unity.VisualScripting.VisualScriptingCanvas`1[TGraph].<HandleSelecting>b__113_4 (Unity.VisualScripting.IGraphElementWidget widget) (at Library/PackageCache/com.unity.visualscripting@1.7.6/Editor/VisualScripting.Core/Canvases/VisualScriptingCanvas.cs:873)
System.Linq.Enumerable+WhereSelectEnumerableIterator`2[TSource,TResult].MoveNext () (at <61774763be294c9f8e2c781f10819224>:0)
System.Collections.Generic.HashSet`1[T].UnionWith (System.Collections.Generic.IEnumerable`1[T] other) (at <61774763be294c9f8e2c781f10819224>:0)
Unity.VisualScripting.GraphSelection.UnionWith (System.Collections.Generic.IEnumerable`1[T] other) (at Library/PackageCache/com.unity.visualscripting@1.7.6/Editor/VisualScripting.Core/Context/GraphSelection.cs:139)
Unity.VisualScripting.GraphSelection.Select (System.Collections.Generic.IEnumerable`1[T] items) (at Library/PackageCache/com.unity.visualscripting@1.7.6/Editor/VisualScripting.Core/Context/GraphSelection.cs:46)
Unity.VisualScripting.VisualScriptingCanvas`1[TGraph].HandleSelecting () (at Library/PackageCache/com.unity.visualscripting@1.7.6/Editor/VisualScripting.Core/Canvases/VisualScriptingCanvas.cs:873)
Unity.VisualScripting.VisualScriptingCanvas`1[TGraph].HandleLowPriorityInput () (at Library/PackageCache/com.unity.visualscripting@1.7.6/Editor/VisualScripting.Core/Canvases/VisualScriptingCanvas.cs:337)
Unity.VisualScripting.VisualScriptingCanvas`1[TGraph].OnGUI () (at Library/PackageCache/com.unity.visualscripting@1.7.6/Editor/VisualScripting.Core/Canvases/VisualScriptingCanvas.cs:286)
Unity.VisualScripting.GraphWindow.OnGUI () (at Library/PackageCache/com.unity.visualscripting@1.7.6/Editor/VisualScripting.Core/Windows/GraphWindow.cs:704)
UnityEditor.HostView.InvokeOnGUI (UnityEngine.Rect onGUIPosition) (at <3cbc70f1ae9747e88614d75932150c59>:0)
UnityEditor.DockArea.DrawView (UnityEngine.Rect dockAreaRect) (at <3cbc70f1ae9747e88614d75932150c59>:0)
UnityEditor.DockArea.OldOnGUI () (at <3cbc70f1ae9747e88614d75932150c59>:0)
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 <34e2272108514d61a3bdf37893a34ef9>:0)
UnityEngine.UIElements.IMGUIContainer.HandleIMGUIEvent (UnityEngine.Event e, UnityEngine.Matrix4x4 worldTransform, UnityEngine.Rect clippingRect, System.Action onGUIHandler, System.Boolean canAffectFocus) (at <34e2272108514d61a3bdf37893a34ef9>:0)
UnityEngine.UIElements.IMGUIContainer.HandleIMGUIEvent (UnityEngine.Event e, System.Action onGUIHandler, System.Boolean canAffectFocus) (at <34e2272108514d61a3bdf37893a34ef9>:0)
UnityEngine.UIElements.IMGUIContainer.HandleIMGUIEvent (UnityEngine.Event e, System.Boolean canAffectFocus) (at <34e2272108514d61a3bdf37893a34ef9>:0)
UnityEngine.UIElements.IMGUIContainer.SendEventToIMGUIRaw (UnityEngine.UIElements.EventBase evt, System.Boolean canAffectFocus, System.Boolean verifyBounds) (at <34e2272108514d61a3bdf37893a34ef9>:0)
UnityEngine.UIElements.IMGUIContainer.SendEventToIMGUI (UnityEngine.UIElements.EventBase evt, System.Boolean canAffectFocus, System.Boolean verifyBounds) (at <34e2272108514d61a3bdf37893a34ef9>:0)
UnityEngine.UIElements.IMGUIContainer.HandleEvent (UnityEngine.UIElements.EventBase evt) (at <34e2272108514d61a3bdf37893a34ef9>:0)
UnityEngine.UIElements.CallbackEventHandler.HandleEventAtTargetPhase (UnityEngine.UIElements.EventBase evt) (at <34e2272108514d61a3bdf37893a34ef9>:0)
UnityEngine.UIElements.MouseCaptureDispatchingStrategy.DispatchEvent (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel) (at <34e2272108514d61a3bdf37893a34ef9>:0)
UnityEngine.UIElements.EventDispatcher.ApplyDispatchingStrategies (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel, System.Boolean imguiEventIsInitiallyUsed) (at <34e2272108514d61a3bdf37893a34ef9>:0)
UnityEngine.UIElements.EventDispatcher.ProcessEvent (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel) (at <34e2272108514d61a3bdf37893a34ef9>:0)
UnityEngine.UIElements.EventDispatcher.ProcessEventQueue () (at <34e2272108514d61a3bdf37893a34ef9>:0)
UnityEngine.UIElements.EventDispatcher.OpenGate () (at <34e2272108514d61a3bdf37893a34ef9>:0)
UnityEngine.UIElements.EventDispatcherGate.Dispose () (at <34e2272108514d61a3bdf37893a34ef9>:0)
UnityEngine.UIElements.EventDispatcher.ProcessEvent (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel) (at <34e2272108514d61a3bdf37893a34ef9>:0)
UnityEngine.UIElements.EventDispatcher.Dispatch (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel, UnityEngine.UIElements.DispatchMode dispatchMode) (at <34e2272108514d61a3bdf37893a34ef9>:0)
UnityEngine.UIElements.BaseVisualElementPanel.SendEvent (UnityEngine.UIElements.EventBase e, UnityEngine.UIElements.DispatchMode dispatchMode) (at <34e2272108514d61a3bdf37893a34ef9>:0)
UnityEngine.UIElements.UIElementsUtility.DoDispatch (UnityEngine.UIElements.BaseVisualElementPanel panel) (at <34e2272108514d61a3bdf37893a34ef9>:0)
UnityEngine.UIElements.UIElementsUtility.UnityEngine.UIElements.IUIElementsUtility.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr, System.Boolean& eventHandled) (at <34e2272108514d61a3bdf37893a34ef9>:0)
UnityEngine.UIElements.UIEventRegistration.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr) (at <34e2272108514d61a3bdf37893a34ef9>:0)
UnityEngine.UIElements.UIEventRegistration+<>c.<.cctor>b__1_2 (System.Int32 i, System.IntPtr ptr) (at <34e2272108514d61a3bdf37893a34ef9>:0)
UnityEngine.GUIUtility.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr, System.Boolean& result) (at <695faf76f532483db7f1d27830010336>:0)
{code}

{code:java}
NullReferenceException: Object reference not set to an instance of an object
Unity.VisualScripting.VisualScriptingCanvas`1[TGraph].get_groupArea () (at Library/PackageCache/com.unity.visualscripting@1.7.6/Editor/VisualScripting.Core/Canvases/VisualScriptingCanvas.cs:897)
Unity.VisualScripting.VisualScriptingCanvas`1[TGraph].DrawOverlay () (at Library/PackageCache/com.unity.visualscripting@1.7.6/Editor/VisualScripting.Core/Canvases/VisualScriptingCanvas.cs:1508)
Unity.VisualScripting.VisualScriptingCanvas`1[TGraph].OnGUI () (at Library/PackageCache/com.unity.visualscripting@1.7.6/Editor/VisualScripting.Core/Canvases/VisualScriptingCanvas.cs:272)
Unity.VisualScripting.GraphWindow.OnGUI () (at Library/PackageCache/com.unity.visualscripting@1.7.6/Editor/VisualScripting.Core/Windows/GraphWindow.cs:704)
UnityEditor.HostView.InvokeOnGUI (UnityEngine.Rect onGUIPosition) (at <3cbc70f1ae9747e88614d75932150c59>:0)
UnityEditor.DockArea.DrawView (UnityEngine.Rect dockAreaRect) (at <3cbc70f1ae9747e88614d75932150c59>:0)
UnityEditor.DockArea.OldOnGUI () (at <3cbc70f1ae9747e88614d75932150c59>:0)
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 <34e2272108514d61a3bdf37893a34ef9>:0)
UnityEngine.UIElements.IMGUIContainer.HandleIMGUIEvent (UnityEngine.Event e, UnityEngine.Matrix4x4 worldTransform, UnityEngine.Rect clippingRect, System.Action onGUIHandler, System.Boolean canAffectFocus) (at <34e2272108514d61a3bdf37893a34ef9>:0)
UnityEngine.UIElements.IMGUIContainer.DoIMGUIRepaint () (at <34e2272108514d61a3bdf37893a34ef9>:0)
UnityEngine.UIElements.UIR.RenderChainCommand.ExecuteNonDrawMesh (UnityEngine.UIElements.UIR.DrawParams drawParams, System.Single pixelsPerPoint, System.Exception& immediateException) (at <34e2272108514d61a3bdf37893a34ef9>:0)
Rethrow as ImmediateModeException
UnityEngine.UIElements.UIR.RenderChain.Render () (at <34e2272108514d61a3bdf37893a34ef9>:0)
UnityEngine.UIElements.UIRRepaintUpdater.Update () (at <34e2272108514d61a3bdf37893a34ef9>:0)
UnityEngine.UIElements.VisualTreeUpdater.UpdateVisualTreePhase (UnityEngine.UIElements.VisualTreeUpdatePhase phase) (at <34e2272108514d61a3bdf37893a34ef9>:0)
UnityEngine.UIElements.Panel.UpdateForRepaint () (at <34e2272108514d61a3bdf37893a34ef9>:0)
UnityEngine.UIElements.Panel.Repaint (UnityEngine.Event e) (at <34e2272108514d61a3bdf37893a34ef9>:0)
UnityEngine.UIElements.UIElementsUtility.DoDispatch (UnityEngine.UIElements.BaseVisualElementPanel panel) (at <34e2272108514d61a3bdf37893a34ef9>:0)
UnityEngine.UIElements.UIElementsUtility.UnityEngine.UIElements.IUIElementsUtility.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr, System.Boolean& eventHandled) (at <34e2272108514d61a3bdf37893a34ef9>:0)
UnityEngine.UIElements.UIEventRegistration.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr) (at <34e2272108514d61a3bdf37893a34ef9>:0)
UnityEngine.UIElements.UIEventRegistration+<>c.<.cctor>b__1_2 (System.Int32 i, System.IntPtr ptr) (at <34e2272108514d61a3bdf37893a34ef9>:0)
UnityEngine.GUIUtility.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr, System.Boolean& result) (at <695faf76f532483db7f1d27830010336>:0)
{code}

{code:java}
NullReferenceException: Object reference not set to an instance of an object
Unity.VisualScripting.VisualScriptingCanvas`1[TGraph].get_groupArea () (at Library/PackageCache/com.unity.visualscripting@1.7.6/Editor/VisualScripting.Core/Canvases/VisualScriptingCanvas.cs:897)
Unity.VisualScripting.VisualScriptingCanvas`1[TGraph].HandleLassoing () (at Library/PackageCache/com.unity.visualscripting@1.7.6/Editor/VisualScripting.Core/Canvases/VisualScriptingCanvas.cs:826)
Unity.VisualScripting.VisualScriptingCanvas`1[TGraph].HandleLowPriorityInput () (at Library/PackageCache/com.unity.visualscripting@1.7.6/Editor/VisualScripting.Core/Canvases/VisualScriptingCanvas.cs:335)
Unity.VisualScripting.VisualScriptingCanvas`1[TGraph].OnGUI () (at Library/PackageCache/com.unity.visualscripting@1.7.6/Editor/VisualScripting.Core/Canvases/VisualScriptingCanvas.cs:286)
Unity.VisualScripting.GraphWindow.OnGUI () (at Library/PackageCache/com.unity.visualscripting@1.7.6/Editor/VisualScripting.Core/Windows/GraphWindow.cs:704)
UnityEditor.HostView.InvokeOnGUI (UnityEngine.Rect onGUIPosition) (at <3cbc70f1ae9747e88614d75932150c59>:0)
UnityEditor.DockArea.DrawView (UnityEngine.Rect dockAreaRect) (at <3cbc70f1ae9747e88614d75932150c59>:0)
UnityEditor.DockArea.OldOnGUI () (at <3cbc70f1ae9747e88614d75932150c59>:0)
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 <34e2272108514d61a3bdf37893a34ef9>:0)
UnityEngine.UIElements.IMGUIContainer.HandleIMGUIEvent (UnityEngine.Event e, UnityEngine.Matrix4x4 worldTransform, UnityEngine.Rect clippingRect, System.Action onGUIHandler, System.Boolean canAffectFocus) (at <34e2272108514d61a3bdf37893a34ef9>:0)
UnityEngine.UIElements.IMGUIContainer.HandleIMGUIEvent (UnityEngine.Event e, System.Action onGUIHandler, System.Boolean canAffectFocus) (at <34e2272108514d61a3bdf37893a34ef9>:0)
UnityEngine.UIElements.IMGUIContainer.HandleIMGUIEvent (UnityEngine.Event e, System.Boolean canAffectFocus) (at <34e2272108514d61a3bdf37893a34ef9>:0)
UnityEngine.UIElements.IMGUIContainer.SendEventToIMGUIRaw (UnityEngine.UIElements.EventBase evt, System.Boolean canAffectFocus, System.Boolean verifyBounds) (at <34e2272108514d61a3bdf37893a34ef9>:0)
UnityEngine.UIElements.IMGUIContainer.SendEventToIMGUI (UnityEngine.UIElements.EventBase evt, System.Boolean canAffectFocus, System.Boolean verifyBounds) (at <34e2272108514d61a3bdf37893a34ef9>:0)
UnityEngine.UIElements.IMGUIContainer.HandleEvent (UnityEngine.UIElements.EventBase evt) (at <34e2272108514d61a3bdf37893a34ef9>:0)
UnityEngine.UIElements.CallbackEventHandler.HandleEventAtTargetPhase (UnityEngine.UIElements.EventBase evt) (at <34e2272108514d61a3bdf37893a34ef9>:0)
UnityEngine.UIElements.MouseCaptureDispatchingStrategy.DispatchEvent (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel) (at <34e2272108514d61a3bdf37893a34ef9>:0)
UnityEngine.UIElements.EventDispatcher.ApplyDispatchingStrategies (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel, System.Boolean imguiEventIsInitiallyUsed) (at <34e2272108514d61a3bdf37893a34ef9>:0)
UnityEngine.UIElements.EventDispatcher.ProcessEvent (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel) (at <34e2272108514d61a3bdf37893a34ef9>:0)
UnityEngine.UIElements.EventDispatcher.ProcessEventQueue () (at <34e2272108514d61a3bdf37893a34ef9>:0)
UnityEngine.UIElements.EventDispatcher.OpenGate () (at <34e2272108514d61a3bdf37893a34ef9>:0)
UnityEngine.UIElements.EventDispatcherGate.Dispose () (at <34e2272108514d61a3bdf37893a34ef9>:0)
UnityEngine.UIElements.EventDispatcher.ProcessEvent (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel) (at <34e2272108514d61a3bdf37893a34ef9>:0)
UnityEngine.UIElements.EventDispatcher.Dispatch (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel, UnityEngine.UIElements.DispatchMode dispatchMode) (at <34e2272108514d61a3bdf37893a34ef9>:0)
UnityEngine.UIElements.BaseVisualElementPanel.SendEvent (UnityEngine.UIElements.EventBase e, UnityEngine.UIElements.DispatchMode dispatchMode) (at <34e2272108514d61a3bdf37893a34ef9>:0)
UnityEngine.UIElements.UIElementsUtility.DoDispatch (UnityEngine.UIElements.BaseVisualElementPanel panel) (at <34e2272108514d61a3bdf37893a34ef9>:0)
UnityEngine.UIElements.UIElementsUtility.UnityEngine.UIElements.IUIElementsUtility.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr, System.Boolean& eventHandled) (at <34e2272108514d61a3bdf37893a34ef9>:0)
UnityEngine.UIElements.UIEventRegistration.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr) (at <34e2272108514d61a3bdf37893a34ef9>:0)
UnityEngine.UIElements.UIEventRegistration+<>c.<.cctor>b__1_2 (System.Int32 i, System.IntPtr ptr) (at <34e2272108514d61a3bdf37893a34ef9>:0)
UnityEngine.GUIUtility.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr, System.Boolean& result) (at <695faf76f532483db7f1d27830010336>:0)
{code}

*Expected Results:*
* No errors should appear in the console
* The user should be able to create as many node groups as intended.