Does a defendant have to make a timely objection and/or request an admonition at trial to preserve for appeal a claim of prosecutorial misconduct?

preserve for appeal a claim of prosecutorial misconduct, the defense must make a timely objection at trial and request an admonition . . . .' " (Ibid.) As an exception to this rule, "[a] defendant will be excused from the necessity of either a timely objection and/or a request for admonition if either would be futile. [Citations.] In addition, failure to request the jury be admonished does not forfeit the issue for appeal if ' "an admonition would not have cured the harm caused by the misconduct." ' " (People v. Hill (1998) 17 Cal.4th 800, 820.)