How to reproduce:

1. Create a new VFX

2. Add Simple Particle system
3. Rename graph to 'p'
4. Enter Play Mode
5. Exit Play Mode
6. Focus graph named 'p'

Error messages:

{color:#de350b}NullReferenceException: Object reference not set to an instance of an object{color}
{color:#de350b}VisualEffectAssetEditor+<>c.<OnInspectorGUI>b__47_0 (UnityEditor.VFX.VFXBasicInitialize d) (at C:/Users/vita.skruibyte/Documents/unity/packages/com.unity.visualeffectgraph/Editor/Inspector/VFXAssetEditor.cs:732){color}
{color:#de350b}System.Linq.Enumerable.Any[TSource] (System.Collections.Generic.IEnumerable`1[T] source, System.Func`2[T,TResult] predicate) (at <f261e5835f884dcba949d9fc74ced366>:0){color}
{color:#de350b}VisualEffectAssetEditor.OnInspectorGUI () (at C:/Users/vita.skruibyte/Documents/unity/packages/com.unity.visualeffectgraph/Editor/Inspector/VFXAssetEditor.cs:731){color}
{color:#de350b}UnityEditor.UIElements.InspectorElement+<>c__DisplayClass71_0.<CreateIMGUIInspectorFromEditor>b__0 () (at <82311000d4eb48fca3bd5778216fbe40>:0){color}
{color:#de350b}UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr, Boolean&){color}