Sometimes while exiting MFC MDI application gets crashed

Hi All,

In one of our MFC MDI (Multiple Document Interface) application, while displaying a dialog box some times it gets crashed on Windows 7.

This problem occurs some times not every times, from the crash dump (.DMP) file analysis it is found that crash occurred inside the DoModal function and it is also found that "this" pointer becomes NULL.

Please suggest what could be the scenario in which "this" pointer becomes NULL and also in which scenario/situation MFC DoModal gets crashed randomly.

Thank You