Commentary for Berakhot 54:8
ובאו ושאלו את רבי ואמר הואיל והתפללו התפללו שאני צבור דלא מטרחינן להו:
since they had said the Tefillah, it must stand. It is different with a Congregation, because we do not put them to trouble.
Abraham Cohen Footnotes to the English Translation of Masechet Berakhot
Hence in the case of an individual, the Tefillah would have to be repeated.
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