query is missing WHERE clause on node type

Line 527, the query built in the else block should be something like this:

    $queryStr = "left join {content_type_%s} ct  on n.nid=ct.nid
                 left join {node_type} nt on n.type=nt.type 
                 WHERE n.type='%s' ";
    $query_args[] = $oaiContentType;
    $query_args[] = $oaiContentType;    
  }

as currently it is returning all nodes from the site.