Qchart exception triggered - c++

Question

I'm developing an application that shows 3 charts in the main window and everything works fine. but now I came across an error when I make the instance
of the main window inside the class of another window the application crush and when do the debugger shows an exception triggered in one of the charts.
I used a graphic view and promote to Qchartview and for each chart the code is this:
chart_1
QPieSlice *slice = pieSeries->slices().at(0);
QFont font = slice->labelFont() ;
font.setBold(true);
font.setPointSize(15);
slice->setExploded();
slice->setLabelVisible();
slice->setPen(QPen(Qt::darkGreen, 1));
slice->setBrush(Qt::darkBlue);
slice->setLabelFont(font);
QChart *chart = new QChart();
chart->addSeries(pieSeries);
chart->setTitle("<h2>Total money of each currency</h2>");
chart->setAnimationOptions(QChart::SeriesAnimations);
chart->legend()->setVisible(true);
chart->legend()->setAlignment(Qt::AlignBottom);
pieSeries->setLabelsVisible();
pieSeries->setLabelsPosition(QPieSlice::LabelOutside);
for(auto slice : pieSeries->slices())
slice->setLabel(QString("%1%").arg(100*slice->percentage(), 0, 'f', 1));
ui->chartView_1->setChart(chart);
ui->chartView_1->setRenderHint(QPainter::Antialiasing);
chart_2
QChart *donutBreakdown = new QChart();
donutBreakdown->setAnimationOptions(QChart::AllAnimations);
donutBreakdown->setTitle("<h2>Cassettes Information</h2>");
donutBreakdown->legend()->setAlignment(Qt::AlignBottom);
donutBreakdown->addSeries(series1);
donutBreakdown->addSeries(pieSeriesPie2);
donutBreakdown->addSeries(series3);
pieSeriesPie2->setLabelsVisible();
pieSeriesPie2->setLabelsPosition(QPieSlice::LabelOutside);
double arm = 0.04;
for(int i = 0; i < pieSeriesPie2->count(); i++){
double arm = (double)i/24;
double arm2= i*0.040;
QPieSlice *slice1 = pieSeriesPie2->slices().at(i);
slice1->setLabelArmLengthFactor(arm2);
}
ui->chartView_2->setChart(donutBreakdown);
ui->chartView_2->setRenderHint(QPainter::Antialiasing);
the two charts are pie chart and the triggered exception is on chart_2
I already replaced the chart_2, already replaced the graphical view that I am using in form
the days that I am fighting this error.
please help me please

Answer 1

Your static_cast
m_slice = static_cast<CustomSlice *>(slice1);
is probably not working as intended. I guess you made the CustomSlice class yourself, which inherits QPieChart. Please take a look at the https://en.cppreference.com/w/cpp/language/static_cast.
Did you mean dynamic_cast? Comment the line(s) out and try to reproduce the error.