In Vester v. Nash/Rocky Mount Board of Education, 124 N.C. App. 400, 477 S.E.2d 246 (1996), the plaintiff-student brought a personal injury action against the board of education after he was struck by a fellow student while on the school bus. Id. Before that incident, the student who struck the plaintiff-student had other disciplinary problems and in many of those instances, no disciplinary action was taken against the student. Id. Under those facts, our Court held that the board of education did not waive sovereign immunity by purchasing liability insurance. Id. Thus, the facts in Vester did not present an exception to the doctrine of sovereign immunity.