segmentation fault with QLineEdit Sender

[saman_artorious]

I have a few QLineEdit-s; When the Edit QPushButton is clicked, I want to know which QLineEdit was selected beforehand.

QLineEdit *clickedLine = qobject_cast<QLineEdit *>(sender());
    clickedLine->setText(";)");

QLineEdit *clickedLine = qobject_cast<QLineEdit *>(sender());
    clickedLine->setText(";)");

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However, in the case I have several push button and want to know which button was clicked, this is accomplished successfully with the same code snippet:

QPushButton *clickedButton = qobject_cast<QPushButton *>(sender());
    int digitValue = clickedButton->text().toInt();
    qDebug() << digitValue;

QPushButton *clickedButton = qobject_cast<QPushButton *>(sender());
    int digitValue = clickedButton->text().toInt();
    qDebug() << digitValue;

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