Opening State Machine Editor Window crashes Unity in 2021.2.9 and newer

[mikeymusch]

Opening the State Machine Editor window will throw a NullReferenceException error, then when you close the editor window Unity crashes.

Here is the error:

NullReferenceException: Object reference not set to an instance of an object
UOP1.StateMachine.Editor.TransitionTableEditorWindow.CreateListView () (at Assets/_Project/Scripts/Editor/TransitionTableEditorWindow.cs:86)
UOP1.StateMachine.Editor.TransitionTableEditorWindow.Update () (at Assets/_Project/Scripts/Editor/TransitionTableEditorWindow.cs:77)
UnityEditor.HostView.SendUpdate () (at :0)
UnityEditor.EditorApplication.Internal_CallUpdateFunctions () (at :0)

[gmiv]

@ciro-unity Do you all have any pointers as to how we can patch this?
This seems like a really great state machine but It's crashing on 2021.3.2f1 OSX M1 for me.