The Fast Show comedian was due to enter the witness box for the prosecution today, but lengthy evidence from an expert witnesses meant the court ran out of time.
Judge Philip Statman brought him into court to apologise personally in front of the jury.
He said: “Mr Whitehouse, I know that you have been here all day.”
Mr Whitehouse, dressed in a dark green suit, replied: “Mmm-huh.”
The judge asked him would it be possible to return this morning.
Mr Whitehouse replied: “Well, if I have to, yeah.”
Langham, 58, denies 15 counts of making an indecent photograph of a child between September and November 2005.
He also denies 10 counts of indecent assault and two counts of buggery between January 1996 and April 2000.
Mr Whitehouse appeared with the defendant in the BBC drama Help, playing different patients seen by a psychiatrist, who was played by Langham.
Yesterday Maidstone Crown Court heard about graphic child porn videos found on a laptop recovered from Langham’s home.
Christopher Crute, forensic computer analyst for Kent Police, said file names made reference to children as young as seven while some included the words “Lolita”, “incest”, “rape”, “whore” and “hussy”.
The case was adjourned until 10.30am at Maidstone Crown Court today.