[SQL] pg_dump Error

[Najm Hashmi]

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
    Segmentation fault (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