Divorce required for Adultery

The second marriage of the husband is null and void as per law as he married during the existence of first marriage.  There are contradicting judgments that the second wife required to take nullity decree from the court or she does not need to do so due to the nullity ab initio.  Any how, my suggestion is to file a nullity case and prove the husband's first marriage while he he performed the marriage with the second wife and the court will give give nullity decree. 

I support the views of Adv Prabhakar,nothing more to add.