[ #36988 ] Double check semi-valid contactproxymodel indexes

src/contactproxymodel.cpp

@@ -417,6 +417,7 @@ QModelIndex ContactProxyModel::index( int row, int column, const QModelIndex& pa
       switch(parentNode->type()) {
          case CategorizedCompositeNode::Type::TOP_LEVEL: {
             TopLevelItem* tld = static_cast<TopLevelItem*>(parentNode);
+            if (tld && row < tld->m_lChildren.size())
                return createIndex(row,column,(void*)tld->m_lChildren[row]);
          }
             break;