Why doesn't unassigned goal stop execution?

At about 5m20s in the video, Sam explains that the AI Controller needs its Goal property set to a GameObject if Ethan is going to move. Prior to that, Ethan just idles. But the game does run, which I don’t understand as Sam gets the same error message I do, at the bottom of the Unity Editor: UnassignedReferenceException: The variable goal of AIController has not been assigned. When I run the game, it pauses. Why doesn’t Sam’s game pause?

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