protobuf crash

int ScoreWrite(string output_pbuf, OverallScores overall, MetaInfo minfo)
{
    DLOG("SCOR: start ScoreWrite()");
  hlcam::communication::scores::ScoreBook score_book;

  /*{ fstream input(output_pbuf.c_str(), ios::in | ios::binary);
    if(!input)
    { cout << " File not found, creating new one." << endl;
    }
    else if(!score_book.ParseFromIstream(&input))
    { cerr << "Failed to parse score book." << endl;
      return -1;
    }
  }*/
    DLOG("pushing data into protobuf");
    GetDataToPbuf(&score_book, overall, minfo);


    fstream output(output_pbuf.c_str(), ios::out | ios::trunc | ios::binary);
    if(!output)
    {
        DLOG("SCOR: Failed to open output file: %s.", output_pbuf.c_str());
        cerr << "SCOR: Failed to open output file: "<<output_pbuf.c_str() <<" ."<<endl;
      return -1;
    }

    DLOG("File opened for writing");
    if(!score_book.SerializeToOstream(&output))
    {
        DLOG("Failed to serialize data to stream");
     cerr << "Failed to write score book." << endl;
      return -1;
    }
        DLOG("shutting down protobuf");

    google::protobuf::ShutdownProtobufLibrary();
        DLOG("shutdown of protobuf successul");
    return 0;
}