Deleting rows in QTableView

Faced with one problem. I have a table in which by pressing the buttons you can add, insert between existing lines and delete lines. When all the lines are deleted and I press the delete button again, the program crashes.

And the same with the insert button. I can not fix the error. I understand that there is an error in the code, but I don’t know how to implement it differently. I tried to prescribe restrictions, nothing happened either. I would be grateful for the help! Here is my full code:

Mainwindow.h file

#ifndef MAINWINDOW_H #define MAINWINDOW_H #include <QMainWindow> #include "mymodel.h" namespace Ui { class MainWindow; } class MainWindow : public QMainWindow { Q_OBJECT public: explicit MainWindow(QWidget *parent = nullptr); ~MainWindow(); private slots: void on_pushButton_clicked(); void on_pushButton_2_clicked(); void on_pushButton_3_clicked(); private: Ui::MainWindow *ui; MyModel *Model; }; #endif // MAINWINDOW_H 

File mymodel.h

 #ifndef MYMODEL_H #define MYMODEL_H #include <QAbstractTableModel> #include <QVector> #include "sport.h" class MyModel : public QAbstractTableModel { Q_OBJECT public: explicit MyModel(QObject *parent = nullptr); int rowCount(const QModelIndex &parent = QModelIndex()) const ; int columnCount(const QModelIndex &parent = QModelIndex()) const; QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const; bool setData(const QModelIndex & index, const QVariant & value, int role = Qt::EditRole); Qt::ItemFlags flags(const QModelIndex & index) const; QVariant headerData(int section, Qt::Orientation orientation, int role) const; bool insertRows(int row, int count, const QModelIndex & parent = QModelIndex()); bool removeRows(int row, int count, const QModelIndex & parent = QModelIndex()); signals: // void editCompleted(const QString &); public slots: private: QVector<Sport> GridData; }; #endif // MYMODEL_H 

File sport.h

 #ifndef SPORT_H #define SPORT_H #include <QString> class Sport { public: Sport (); Sport (QString name, QString code); Sport (const Sport& v); Sport& operator= (const Sport&); QString name () const; QString code () const; float ball () const; int mesto () const; void setName (QString name); void setCode (QString code); void setMesto (int m); void setBall (float b); private: QString Name, Code; float Ball; int Mesto; }; #endif // SPORT_H 

Mainwindow.cpp file

 #include "mainwindow.h" #include "ui_mainwindow.h" MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow) { ui->setupUi(this); Model = new MyModel; ui->tableView->setModel(Model); } MainWindow::~MainWindow() { delete ui; } void MainWindow::on_pushButton_clicked() { //add int row = Model->rowCount(); Model->insertRows(row, 1); QModelIndex in = Model->index(row, 1); ui->tableView->setCurrentIndex(in); ui->tableView->edit(in); } void MainWindow::on_pushButton_2_clicked() { //insert int row = ui->tableView->currentIndex().row(); Model->insertRows(row, 1); QModelIndex in = Model->index(row, 1); ui->tableView->setCurrentIndex(in); } void MainWindow::on_pushButton_3_clicked() { //delete Model->removeRows(ui->tableView->currentIndex().row(),1); } 

Mymodel.cpp file

 #include "mymodel.h" MyModel::MyModel(QObject *parent) : QAbstractTableModel(parent) { GridData.resize(1); } int MyModel::rowCount(const QModelIndex &parent) const { return GridData.size(); } int MyModel::columnCount(const QModelIndex &parent) const { return 4; } QVariant MyModel::data(const QModelIndex &index, int role) const { if (role == Qt::DisplayRole) { switch (index.column()) { case 0: return GridData[index.row()].name(); case 1: return GridData[index.row()].code(); case 2: return GridData[index.row()].ball(); case 3: return GridData[index.row()].mesto(); default: break; } } return QVariant(); } QVariant MyModel::headerData(int section, Qt::Orientation orientation, int role) const { if (role == Qt::DisplayRole && orientation == Qt::Horizontal) { switch (section) { case 0: return QVariant("Фамилия участника"); case 1: return QVariant("Код команды"); case 2: return QVariant("Количество балов"); case 3: return QVariant("Место в итоге"); default: break; } } return QVariant(); } bool MyModel::setData(const QModelIndex &index, const QVariant &value, int role) { if (role == Qt::EditRole) { //save value from editor to member m_gridData // m_gridData[index.row()][index.column()] = value.toString(); switch (index.column()) { case 0: GridData[index.row()].setName(value.toString()); break; case 1: GridData[index.row()].setCode(value.toString()); break; case 2: GridData[index.row()].setBall(value.toInt()); break; case 3: GridData[index.row()].setMesto(value.toInt()); break; } } return true; } Qt::ItemFlags MyModel::flags(const QModelIndex &index) const { return Qt::ItemIsEditable | QAbstractTableModel::flags(index); } bool MyModel::insertRows(int row, int count, const QModelIndex &parent) { beginInsertRows(parent,row, row + count - 1); GridData.insert(row, count, Sport()); endInsertRows(); return true; } bool MyModel::removeRows(int row, int count, const QModelIndex &parent) { beginRemoveRows(parent,row, row + count - 1); GridData.remove(row, count); endRemoveRows(); return true; } 

Sport.cpp file

 #include "sport.h" Sport::Sport(): Ball(0.0), Mesto(0) { } Sport::Sport(QString name, QString code): Name(name), Code(code), Ball(0.0), Mesto(0) { } Sport::Sport(const Sport &v) { this->Name = v.Name; this->Code = v.Code; this->Ball = v.Ball; this->Mesto = v.Mesto; } Sport &Sport::operator =(const Sport &v) { this->Name = v.Name; this->Code = v.Code; this->Ball = v.Ball; this->Mesto = v.Mesto; return *this; } QString Sport::name() const { return Name; } QString Sport::code() const { return Code; } float Sport::ball() const { return Ball; } int Sport::mesto() const { return Mesto; } void Sport::setName(QString name) { this->Name = name; } void Sport::setCode(QString code) { this->Code = code; } void Sport::setBall(float b) { this->Ball = b; } void Sport::setMesto(int m) { this->Mesto = m; }