pg_dump Error - Mailing list pgsql-sql

Hi all,    while trying to dump db shcema and content, I am getting the
following error:
   [najm@localhost najm]$ pg_dump -D fliprdb > flipr.sql   PQgetvalue: ERROR! tuple number 0 is out of range 0..-1
Segmentationfault (core dumped)
 

Any suggestion what I am doing wrong and why i am getting this error.
Thank you all in advance for your help
Regards.
Najm