Nolan Roux converted a stoppage-time penalty as St Etienne preserved their unbeaten home league record this season with a 1-1 home draw against Dijon.Substitute striker Roux placed his spot kick into the top corner in the fifth minute of added time after Quentin Bernard had fouled Loic Perrin to cancel out Pierre Lees-Melou's first-half opener for Dijon.Lees-Melou headed home Florent Balmont's cross in the 22nd minute and while Jordan Veretout, Cheikh M'Bengue and Roux all went close for St Etienne, Frederic Sammaritano forced a fine save from home goalkeeper Stephane Ruffier before the late penalty decision.Dijon's Bernard was booked for his challenge on Perrin, while team-mate and fellow defender Cedric Varrault was shown a straight red card for remonstrating with the referee.