Hello Ravi,
I compared the map with production and development since we use transport mechanism map is same for all the environment and issue occurs in production alone.I tried the same data with quality and checked whether null record is syndicating(checked with both automatic and manual process) or not but record was not syndicated.But in production this issue is happening once or twice in a month can't able to trace the issue since the record got updated.
Regards,
Keerthi