Ibn Hibban reported this from Talq [bin 'Ali (RA)]:

"The prayer of a person who prays alone behind the row is not accepted.

وَلَهُ عَنْ طَلْق ٍ [1]‏ { لَا صَلَاةَ لِمُنْفَرِدٍ خَلْفَ اَلصَّفِّ } [2]‏ .‏