Error in console

[g.sardano]

I don’t know why, but when I finished the Enemy movement script and run the game, the folllowing error message appear:
NullReferenceException: Object reference not set to an instance of an object
UnityEditor.Graphs.Edge.WakeUp () (at :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 :0)
UnityEditor.Graphs.Graph.WakeUpEdges (System.Boolean clearSlotEdges) (at :0)
UnityEditor.Graphs.Graph.WakeUp (System.Boolean force) (at :0)
UnityEditor.Graphs.Graph.WakeUp () (at :0)
UnityEditor.Graphs.Graph.OnEnable () (at :0)

[bixarrio]

Yea, this happens sometimes. It’s a Unity error. Restarting Unity usually fixes it.