Null Reference Error

[robert-kuropkat]

Not sure what is causing this. May or may not have been a result of me copying a script once then getting rid of it.

NullReferenceException: Object reference not set to an instance of an object
UnityEditor.Graphs.Edge.WakeUp () (at <7aa85f2d6cfd4424895aac5c1bc34f7e>:0)
UnityEditor.Graphs.Graph.DoWakeUpEdges (System.Collections.Generic.List1[T] inEdges, System.Collections.Generic.List1[T] ok, System.Collections.Generic.List`1[T] error, System.Boolean inEdgesUsedToBeValid) (at <7aa85f2d6cfd4424895aac5c1bc34f7e>:0)
UnityEditor.Graphs.Graph.WakeUpEdges (System.Boolean clearSlotEdges) (at <7aa85f2d6cfd4424895aac5c1bc34f7e>:0)
UnityEditor.Graphs.Graph.WakeUp (System.Boolean force) (at <7aa85f2d6cfd4424895aac5c1bc34f7e>:0)
UnityEditor.Graphs.Graph.WakeUp () (at <7aa85f2d6cfd4424895aac5c1bc34f7e>:0)
UnityEditor.Graphs.Graph.OnEnable () (at <7aa85f2d6cfd4424895aac5c1bc34f7e>:0)