GENERAL PART
TITLE TWO
CRIMINAL OFFENCE
1. General provisions on criminal Offences
Error of fact
Article 18
(1) An act committed under an irreparable error of fact shall not constitute a criminal offence.
(2) An irreparable error of fact exists where a perpetrator was not obliged to avoid and could not have avoided the error with respect to a factual circumstance regarded as an element of crime or with respect to a factual circumstance which, had it existed, would have made the act lawful.
(3) If the perpetrator acted under an error of law due to negligence, the act shall constitute a criminal offence committed by negligence where so provided by law.
Mistake of fact - national proceedings
EDIT.