Section 257: Erroneous sentence or process or warrant

If the sentence was passed, or the process was issued, by a court (including a native
tribunal) having jurisdiction under any circumstances to pass such a sentence or to
issue such process, or if the warrant was issued by a court (including a customary and
an area court) or judicial officer or other person having authority in any circumstances
to issue such a warrant, it is immaterial whether the court or judicial officer or person
had or had not authority to pass the sentence or issue the process or warrant in the
particular case; unless the person executing the same knows that the sentence or
process or warrant, was in fact passed or issued without authority.