A young Yahoo 7 reporter who had a murder trial aborted has been ordered to front the Supreme Court with her boss to explain what happened.

Sydney-based online reporter Krystal Johnson filed a report on the Melbourne trial that included information not presented to the jury.

Rookie online reporter Krystal Johnson at Yahoo 7 has had a murder trial aborted.

The addition of a Facebook post risked causing an unfair trial, the Supreme Court heard.

Justice Lex Lasry discharged the jury in the case on Monday.