Infinite loop while reading a CSV file on a Qt5 application

I am currently working on a Qt application which works with CSV files. I have implemented a method whose only objective is to display content on the console (for the moment).

Here is the relevant code:

Class AppMainWindow, method loadCsv

void AppMainWindow::loadCsv() {
    cout << "Sélection du fichier" << endl;

    QString fileName = QFileDialog::getOpenFileName(NULL, "Ouvrir un fichier", QString(), "Tableau CSV (*.csv)");
    if (fileName != NULL && !fileName.isEmpty()) {
        cout << "Ouverture du fichier \"" << fileName.toStdString() << "\"" << endl;
        string name = fileName.toStdString();
        vector<vector<string>> data = CsvReader::readCsv(&name);
    } else
        cout << "Pas de fichier sélectionné" << endl;
}

CsvReader.h

#include <fstream>
#include <iostream>
#include <sstream>
#include <string>
#include <vector>

using namespace std;

namespace CsvReader {
    vector< vector<string> > readCsv(string *fileStream);
}

CsvReader.cpp

#include "src/com/alten/utility/CsvReader.h"

vector<vector<string>> CsvReader::readCsv(string *fileName) {
    vector < vector<string> > data;
    string line;

    ifstream fileStream(*fileName);
    while (getline(fileStream, line)) {
        vector < string > row;
        string element;

        cout << "Ligne :" << line << endl;

        stringstream lineStream(line);
        while (getline(lineStream, element, ',')) {
            cout << "Item :" << element << endl;
            row.push_back(element);
        }

        data.push_back(row);
    }

    fileStream.close();
}

When I load any CSV file, loadCsv executes normally until the end of the if statement, where the Qt application suddenly freezes.

There is not that problem when I remove my if statement:

void AppMainWindow::loadCsv() {
    cout << "Sélection du fichier" << endl;

    QString fileName = QFileDialog::getOpenFileName(NULL, "Ouvrir un fichier", QString(), "Tableau CSV (*.csv)");
    cout << "Ouverture du fichier \"" << fileName.toStdString() << "\"" << endl;
    string name = fileName.toStdString();
    vector<vector<string>> data = CsvReader::readCsv(&name);
}

I am not Cpp-fluent, could anyone please explain to me where do the error come from?

NB: I compile my code with cmake.