Loading text with the first line ending with tabulator causes crash

[Zorki]

I tried to make a small example containing the critical code, but it is not exact the same, since the program already crashes loading the file.

#include <QtGui/QApplication>
#include "mainwindow.h"
 
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();
    return a.exec();
}

#include <QtGui/QApplication>
#include "mainwindow.h"

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();
    return a.exec();
}

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#ifndef MAINWINDOW_H
#define MAINWINDOW_H
 
#include <QtGui/QMainWindow>
#include <QtGui>
 
class MainWindow : public QMainWindow
{
    Q_OBJECT
 
public:
    MainWindow(QWidget *parent = 0);
    ~MainWindow();
 
private:
    QLabel *label;
};
 
#endif // MAINWINDOW_H

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QtGui/QMainWindow>
#include <QtGui>

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    MainWindow(QWidget *parent = 0);
    ~MainWindow();

private:
    QLabel *label;
};

#endif // MAINWINDOW_H

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#include "mainwindow.h"
 
MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
{
    this->label = new QLabel();
    this->setCentralWidget(label);
 
 
    QString filePath("crash.txt");
    QFile f(filePath);
    if(f.open(QFile::ReadOnly)) {
    QTextStream s(&f);
 
    this->label->setText(s.readAll()); // Crash
    } else {
    this->label->setText(tr("File ") + filePath + tr(" could not be read."));
    }
}
 
MainWindow::~MainWindow()
{
 
}

#include "mainwindow.h"

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
{
    this->label = new QLabel();
    this->setCentralWidget(label);


    QString filePath("crash.txt");
    QFile f(filePath);
    if(f.open(QFile::ReadOnly)) {
    QTextStream s(&f);

    this->label->setText(s.readAll()); // Crash
    } else {
    this->label->setText(tr("File ") + filePath + tr(" could not be read."));
    }
}

MainWindow::~MainWindow()
{

}

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Just calling s.readAll() works fine.
I attached the file that causes the crash. Again everything works, if i delete the tab.