We are using the postgres7 against Linux. We got a pg_dump error when tired to backup a database using pg_dump. The error message is “PQgetvalue: ERROR! tuple number 0 is out of range 0..-1 Segmentation fault“. We could dump this database when it was created. Our database server can’t be shut down after it goes to live, so we can’t use file system backup. Please help me resolve this problem.