Reference for Ketubot 146:8

אלא [אי אתמר הכי אתמר] אמר רבה מחלוקת בטעות אשה אחת כעין שתי נשים אבל בטעות אשה אחת גרידתא דברי הכל אינה צריכה הימנו גט

Rather, if it was said, this is what was said: Rabbah stated: They differ only in the case of an error [involving] a woman [who is in a position] similar [to that of one of] two women, but in the case of an error [involving] merely one woman all agree that she requires no divorce from him.

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