Thread: "Invalid pointer operation" when closing application

Hello. I use Borland C++ 6.0 and I have written an appliaction that gets some web pages' contents and displays some of it (Using FastNet). When I cloase the application (having threee forms) I get an EInvalidPointer exception with message : "Invalid pointer operation" and debugger stops at 397th line in Forms.hpp which stands like this :

Code:

inline __fastcall virtual ~TForm(void) { }

Could you help me to solve this problem, please? Thank all of you in advance.