Section 13 of Civil Procedure Code 1908,
When Foreign Divorce Judgments-decree is not Conclusive.
A foreign judgment shall be conclusive as to any matter thereby directly adjudicated upon between the same parties or between parties under whom they or any of them claim litigating under the same title except-
(a) where it has not been pronounced by a Court of competent jurisdiction;
(b) where it has not been given on the merits of the case;