I am using QTableview + QAbastractTableModel subclass to display order trading data. It works great. But when I use QSortFilterProxyModel for table sorting/filtering, the application crashes if I sort the rows and then add new data row. Sometimes, even a click in the table would result in a crash. I have not changed any codes in the Model . The following are the codes related. Please kindly help.

VIEW:
Qt Code: 
  1. pTableView = new QTableView();
  2.     pModel = new TradeManagerModel(0);
  3.     proxyModel = new QSortFilterProxyModel(this);
  4.     proxyModel->setSourceModel(pModel);
  5.     proxyModel->setDynamicSortFilter(true);
  6.     pTableView->setModel(proxyModel);
  7.     pTableView->setSortingEnabled(true);
To copy to clipboard, switch view to plain text mode 

MODEL: The data is stored in QMap<QString, QStringList> mGridData.
Qt Code: 
  1. int TradeManagerModel::rowCount(const QModelIndex & /*parent*/) const
  2. {
  3.    return mGridData.size();
  4. }
  5.  
  6. int TradeManagerModel::columnCount(const QModelIndex & /*parent*/) const
  7. {
  8.     return 10;
  9. }
  10.  
  11. QVariant TradeManagerModel::data(const QModelIndex &index, int role) const
  12. {
  13.     if (role == Qt::DisplayRole)
  14.     {
  15.         return mGridData[mGridData.keys().at(index.row())].at(index.column());
  16.     }
  17.     return QVariant();
  18. }
  19.  
  20. QVariant TradeManagerModel::headerData(int section, Qt::Orientation orientation, int role) const
  21. {
  22.  
  23.     if (role == Qt::DisplayRole)
  24.     {
  25.         if (orientation == Qt::Horizontal) {
  26.             switch (section)
  27.             {
  28.             case 0:
  29.                 return QString("TIME");
  30.             case 1:
  31.                 return QString("SYMBOL");
  32.             case 2:
  33.                 return QString("B/S");
  34.             case 3:
  35.                 return QString("QTY");
  36.             case 4:
  37.                 return QString("PRICE");
  38.             case 5:
  39.                 return QString("COMM");
  40.             case 6:
  41.                 return QString("STRATEGYID");
  42.             case 7:
  43.                 return QString("EXECID");
  44.             case 8:
  45.                 return QString("ORDERID");
  46.             case 9:
  47.                 return QString("");
  48.             }
  49.         }
  50.     }
  51.     return QVariant();
  52. }
  53.  
  54. void TradeManagerModel::onTradeItemUpdated(const TradeItem &tradeItem)
  55. {
  56.     QString execId = tradeItem.execId;
  57.  
  58.     QStringList tmpStrList;
  59.     tmpStrList << tradeItem.tradeTimeStamp
  60.                << tradeItem.symbol
  61.                << tradeItem.action
  62.                << QString::number(tradeItem.fillQty)
  63.                << QString::number(tradeItem.fillPrice)
  64.                << QString::number(tradeItem.commission)
  65.                << tradeItem.orderRef
  66.                << execId
  67.                << tradeItem.orderId
  68.                <<"";
  69.  
  70.     if(!mGridData.contains(execId))
  71.     {
  72.         mGridData[execId] = tmpStrList;
  73.         emit layoutChanged();
  74.     }
  75.  
  76. }
To copy to clipboard, switch view to plain text mode