6.  Any person lawfully married under any law, religion, custom or usage who during the continuance of that marriage purports to contract a marriage in Singapore or elsewhere under any law, religion, custom or usage in contravention of section 4 shall be deemed to commit the offence of marrying again during the lifetime of the husband or wife, as the case may be, within the meaning of section 494 of the Penal Code (Cap. 224).