Is a jury's failure to give a unanimity instruction in a criminal case a harmless error?

implies that it did not believe the only defense offered,' failure to give a unanimity instruction is harmless error. [Citation.] But if the defendant offered separate defenses to each criminal act, reversal is required. [Citations.] The error is also harmless '[w]here the record indicates the jury resolved the basic credibility dispute against the defendant and therefore would have convicted him of any of the various offenses shown by the evidence . . . .' " (People v. Hernandez (2013) 217 Cal.App.4th 559, 577.)