פירוש על ברכות 60:7

If he omitted the reference when praying with the Congregation, he does not repeat the Tefillah because he will hear it said by the Precentor. Some explain that it refers to the Precentor himself, who does not repeat the Tefillah if he omitted tbe reference, so as not to trouble the Congregation. In view of this teaching, R. Hiyya b. Abba, since he was not praying with a Congregation, was right in repeating the Tefillah.