Victor and Ellen are software engineers working on a popular mobile app. Victor has been in his position for $10$ years longer than Ellen, who is a recent graduate.

During the development of a new feature, Ellen expressed her concern that Victor's proposed code would create instability in the app. Victor told Ellen he would address her concern with their supervisor. When Victor met privately with his supervisor, he claimed that he had discovered the problem, and that Ellen had dismissed it$.$

Which principle of the Software Engineering Code of Ethics has Victor violated?