pqReadData()

Hi all,I was trying to simply update single field in one of my tables as given
below:
fliprdb=#  update artist set extrinfo='independent' where artist_id=6;
pqReadData() -- backend closed the channel unexpectedly.       This probably means the backend terminated abnormally
  before or while processing the request.
 
The connection to the server was lost. Attempting reset: Failed.

Anyone have idea where the problem is and how it can be fixed?
Thank you all in advance.
Regards.Najm