/ˈhɑːrmləs ˈɛrər/ – Phrase
Definition: Lỗi không gây hại.
A more thorough explanation: an error committed during a trial that is not serious enough to affect the outcome of the trial, does not affect a party’s substantive rights (=important rights) and is not grounds for a reversal of the court’s ruling
Example: Mr Osborn argued that depriving the appellant of his chosen counsel was harmless error.