The IPC 1860 was replaced by the BNS 2023 (in force 2024-07-01); no verified section mapping on file for Section 84 — confirm the corresponding provision (savings: Section 358, BNS 2023).
Nothing is an offence which is done by a person who, at the time of doing it, by reason of unsoundness of mind, is incapable of knowing the nature of the act, or that he is doing what is either wrong or contrary to law.