*Reproducible on:*
* VS version: 1.7.4, 1.7.3
* Unity version: 2021.2.0b11
* Platform: Ubuntu 20.04.2

*Steps to Reproduce:*
# Create a game object and attach a script graph to it
# Create a new variable of any type
# Right click on the = next to "Type" and click to duplicate

*Actual Results:*
* Variable is not duplicated and and error appears in the console
* NullReferenceException is thrown in the console
{code:java}
NullReferenceException: Object reference not set to an instance of an object
Unity.VisualScripting.ReorderableList.ReorderableListControl.DefaultContextMenuHandler (System.Object userData) (at Library/PackageCache/com.unity.visualscripting@06720e5909ba-1631283327065/Editor/VisualScripting.Core/Dependencies/ReorderableList/ReorderableListControl.cs:1919)
UnityEditor.GenericMenu.CatchMenu (System.Object userData, System.String[] options, System.Int32 selected) (at /home/bokken/buildslave/unity/build/Editor/Mono/GUI/GenericMenu.cs:125)
{code}

*Expected Results:*
* No errors should appear in the console
* variable should be properly duplicated.