Hadith.2850 - Abdur Rahman ibn al-Hajjaj narrated from Abu Ibrahim (as) about a man who performed eight circuits (Sa'i) between Safa and Marwah.
Imam (as) said
"If it was an error, he should disregard one circuit and count seven as complete."
In another narration from Muhammad ibn Muslim, from one of the Imams (as), it is reported:
"He should add six more circuits to complete it properly."