Article 18
(1) An act committed under an irreparable mistake of fact shall not constitute a criminal offence.
(2) An irreparable mistake of fact exists where a perpetrator was not obliged to avoid and could not have avoided the mistake with respect to a factual circumstance which constitutes an element of criminal offence or with respect to a factual circumstance which, had it truly existed, would have made the act permitted.
(3) If the perpetrator acted under a mistake of fact due to negligence, the act shall constitute a criminal offence committed through negligence where so provided by law.