Drag and Drop Crush when second time drag

[hnd]

Hi forum again me pls help me.

i just want to do that;

ive got two label and i want to drag first label text to drop second label and code worked fine(i dont know why :))). but i want to do this in second time it crushed.
i think i should to clear mimedata but how?? or what i should to do?

here is my . h file

public:
    explicit Dialog(QWidget *parent = nullptr);
    ~Dialog();
    void mousePressEvent(QMouseEvent *event) ;
    QDrag *drag = new QDrag(this);
    QMimeData *mimeData = new QMimeData;
    QString labeltext;
 
 
private:
    Ui::Dialog *ui;
 
protected:
    bool eventFilter(QObject *obj, QEvent *event);

public:
    explicit Dialog(QWidget *parent = nullptr);
    ~Dialog();
    void mousePressEvent(QMouseEvent *event) ;
    QDrag *drag = new QDrag(this);
    QMimeData *mimeData = new QMimeData;
    QString labeltext;


private:
    Ui::Dialog *ui;

protected:
    bool eventFilter(QObject *obj, QEvent *event);

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and dialog .cpp

#include <QEvent>
#include <QDragEnterEvent>
#include <QDragMoveEvent>
#include <QDropEvent>
#include <QDebug>
#include <QMouseEvent>
#include <QDrag>
#include <QMimeData>
 
Dialog::Dialog(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::Dialog)
{
    ui->setupUi(this);
    ui->label_2->installEventFilter(this);
    ui->label_2->setAcceptDrops(true);
}
 
Dialog::~Dialog()
{
    delete ui;
}
 
void Dialog::mousePressEvent(QMouseEvent *event)
 {
     if (event->button() == Qt::LeftButton
         && ui->label->geometry().contains(event->pos()))
     {
 
           labeltext = ui->label->text();
 
         mimeData->setText(labeltext);
         drag->setMimeData(mimeData);
         drag->start();
     }
 }
 
bool Dialog::eventFilter(QObject *obj, QEvent *event)
{
    if (event->type() == QEvent::DragEnter)
    {
        QDragEnterEvent *tDragEnterEvent = static_cast<QDragEnterEvent *>(event);
        tDragEnterEvent->acceptProposedAction();
 
        return true;
    }
 
    else if (event->type() == QEvent::DragMove)
    {
        QDragMoveEvent *tDragMoveEvent = static_cast<QDragMoveEvent *>(event);
        tDragMoveEvent->acceptProposedAction();
 
        return true;
    }
 
 
    else if (event->type() == QEvent::Drop)
    {
        QDropEvent *tDropEvent = static_cast<QDropEvent *>(event);
        tDropEvent->acceptProposedAction();
 
        ui->label_2->setText(mimeData->text());
 
 
        return true;
    }
 
    return QObject::eventFilter(obj, event);
}

#include <QEvent>
#include <QDragEnterEvent>
#include <QDragMoveEvent>
#include <QDropEvent>
#include <QDebug>
#include <QMouseEvent>
#include <QDrag>
#include <QMimeData>

Dialog::Dialog(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::Dialog)
{
    ui->setupUi(this);
    ui->label_2->installEventFilter(this);
    ui->label_2->setAcceptDrops(true);
}

Dialog::~Dialog()
{
    delete ui;
}

void Dialog::mousePressEvent(QMouseEvent *event)
 {
     if (event->button() == Qt::LeftButton
         && ui->label->geometry().contains(event->pos()))
     {

           labeltext = ui->label->text();

         mimeData->setText(labeltext);
         drag->setMimeData(mimeData);
         drag->start();
     }
 }

bool Dialog::eventFilter(QObject *obj, QEvent *event)
{
    if (event->type() == QEvent::DragEnter)
    {
        QDragEnterEvent *tDragEnterEvent = static_cast<QDragEnterEvent *>(event);
        tDragEnterEvent->acceptProposedAction();

        return true;
    }

    else if (event->type() == QEvent::DragMove)
    {
        QDragMoveEvent *tDragMoveEvent = static_cast<QDragMoveEvent *>(event);
        tDragMoveEvent->acceptProposedAction();

        return true;
    }


    else if (event->type() == QEvent::Drop)
    {
        QDropEvent *tDropEvent = static_cast<QDropEvent *>(event);
        tDropEvent->acceptProposedAction();

        ui->label_2->setText(mimeData->text());
        

        return true;
    }

    return QObject::eventFilter(obj, event);
}

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please help mee pleeeeaseeeee :((

(and pls i dont want to use subclass for this)