There is a segmentation fault arising from ~Menu(). Why do the memory cannot be deleted? How to delete the memory at the end of the program?

class MenuItem{ private: char* m_items; MenuItem(); //member function ... ~MenuItem(){ delete[] m_items } friend class Menu; } class Menu{ private: char* m_title; MenuItem* Menu_Item; public: Menu(); //member function ... ~Menu(){ delete[] m_title; delete[] Menu_Item; } }