Crash in QWindowPrivate::applyCursor because the screen is null

Crash: EXCEPTION_ACCESS_VIOLATION_READ at 0x4
  File "qscreen.cpp", line 140, in QScreen::handle
  File "qwindow.cpp", line 2529, in QWindowPrivate::applyCursor
  File "qwindow.cpp", line 523, in QWindow::setVisible
  File "qwidget.cpp", line 7964, in QWidgetPrivate::show_sys
  File "qwidget.cpp", line 7887, in QWidgetPrivate::show_helper
  File "qwidget.cpp", line 8181, in QWidget::setVisible
  File "qdialog.cpp", line 715, in QDialog::setVisible
  File "qwidget.cpp", line 3218, in QWidget::showNormal