Why does the program crash when trying to allocate memory with new?

Question

Qt

https://github.com/fillows2/AOTD-Toster/tree/maste...
Crashes when clicking in the Menu >> Load Map window. Unable to allocate memory via slot MapEditorSFMLWidget::slot_LoadMap(); Through the class constructor "MapEditorSFMLWidget" *m_screen = new MapEditorScreen works fine

Answer 1

Use valgrind, it will show you where you are accessing the allocated memory or using uninitialized variables.

Answer 2

Prepare and upload an archive with a minimal project on which such a problem is reproduced. The less code there is, the easier it is to find the error.