Unless a valid marriage is proved, a second marriage stands invalid and no offence under section 494 IPC attracts.
S Nagalingam Vs Sivagami on 31 August 2001Citations: [2001 AIR SC 3576], [2001 SCALE 6 42], [2001 JT 7 219], [2001 AIR SC 3372], [2001 SCC 7 487], [2001 SUPREME 6 772], [2001 SCC CRI 1273], [2001 OLR 2 648], [2001 ALD CRI 2 634], [2001 AWC SC 4 2998], [2001 ACR SC 3 2486], [2001 DMC SC 2 544], [2002 ALT CRI 1 69]
Other Sources:
https://indiankanoon.org/doc/1386675/
https://www.casemine.com/judgement/in/5609ad9ce4b0149711411daa