*Steps to reproduce:*
# Open VFX Graph
# Add Group node
# Add any node to the workspace e.g. Get Age (make sure it is not in group)
# Right click select Get Age and select Convert To Subgraph Operator

*Actual results:* Subgraph is not created and error is thrown

*Expected results:* Subgraph is created (at least it allows to create subgraphs when nodes are in groups)

*Reproducible with versions:* 6000.0.33f1, 6000.2.0a4

*Not reproducible with versions:* n/a

*Can’t test with versions:* n/a

*Tested on (OS):* Windows

*Notes:*

NullReferenceException: Object reference not set to an instance of an object
UnityEditor.VFX.UI.VFXPaste.PasteGroupNodes (UnityEditor.VFX.UI.VFXCopyPasteCommon+SerializableGraph serializableGraph, UnityEngine.Vector2 center, UnityEditor.VFX.VFXUI ui) (at ./Library/PackageCache/com.unity.visualeffectgraph/Editor/GraphView/Views/VFXPaste.cs:619)
UnityEditor.VFX.UI.VFXPaste.PasteAll (UnityEditor.VFX.UI.VFXViewController viewController, UnityEngine.Vector2 center, UnityEditor.VFX.UI.VFXCopyPasteCommon+SerializableGraph& serializableGraph, UnityEditor.VFX.UI.VFXView view, UnityEditor.VFX.UI.VFXGroupNodeController groupNode, System.Collections.Generic.List`1[T] nodesInTheSameOrder) (at ./Library/PackageCache/com.unity.visualeffectgraph/Editor/GraphView/Views/VFXPaste.cs:287)
UnityEditor.VFX.UI.VFXPaste.DoPaste (UnityEditor.VFX.UI.VFXViewController viewController, UnityEngine.Vector2 center, System.Object data, UnityEditor.VFX.UI.VFXView view, UnityEditor.VFX.UI.VFXGroupNodeController groupNode, System.Collections.Generic.List`1[T] nodesInTheSameOrder) (at ./Library/PackageCache/com.unity.visualeffectgraph/Editor/GraphView/Views/VFXPaste.cs:140)