NullReferenceException: Object reference not set to an instance of an object
UnityEditor.Graphs.Edge.WakeUp () (at <ae70fd9ff3934b27ae8ca4cc88795828>:0)
UnityEditor.Graphs.Graph.DoWakeUpEdges (System.Collections.Generic.List`1[T] inEdges, System.Collections.Generic.List`1[T] ok, System.Collections.Generic.List`1[T] error, System.Boolean inEdgesUsedToBeValid) (at <ae70fd9ff3934b27ae8ca4cc88795828>:0)
UnityEditor.Graphs.Graph.WakeUpEdges (System.Boolean clearSlotEdges) (at <ae70fd9ff3934b27ae8ca4cc88795828>:0)
UnityEditor.Graphs.Graph.WakeUp (System.Boolean force) (at <ae70fd9ff3934b27ae8ca4cc88795828>:0)
UnityEditor.Graphs.Graph.WakeUp () (at <ae70fd9ff3934b27ae8ca4cc88795828>:0)
UnityEditor.Graphs.Graph.OnEnable () (at <ae70fd9ff3934b27ae8ca4cc88795828>:0)