Does the error in admitting a defendant's prior conviction for selling drugs constitute a miscarriage of justice?

Assuming for the sake of argument that the trial court should have excluded the evidence of defendant's prior conviction for selling drugs, any error in its admission was harmless. "The controlling consideration . . . is whether the error has resulted in a 'miscarriage of justice.'" (People v. Watson (1956) 46 Cal.2d 818, 835-836.) A miscarriage of justice occurs only when it appears that the defendant would have obtained a more favorable result absent the error. (Id., at p. 836.)