Found a typo in pgsql.php in DB.

Fundtion nextId() has var seqname in SELECT, should be seq_name:

function nextId($seq_name, $ondemand = true)
{
  $seqname = $this->getSequenceName($seq_name);
  $repeat = 0;
  do {
    $this->pushErrorHandling(PEAR_ERROR_RETURN);
    $result = $this->query("SELECT NEXTVAL('${seqname}')");
                                              ^^^^^^^

[...]
}