メモリのアクセス違反 - TMessageForm::MenuItemClick

<Try to describe precise steps that lead to the problem (where do you click, what keys do you press, what do you see, etc.)>
<If relevant, consider attaching a session log file or a screenshot)>
When we choose 「すべてはい(A)」 to transfer files, we have the following error as given below:

WinSCP 6.6.4

Error message:
メモリのアクセス違反

スタック トレース:
(00B7E4A0) TMessageForm::MenuItemClick
(000B50E0) ntdll.dll
(000B50AF) ntdll.dll
(0006CC4E) ntdll.dll
(0007962A) ntdll.dll
(00002F86) GDI32.dll
(00079604) ntdll.dll
(00B7E498) TMessageForm::MenuItemClick
(0057571B) Tb2item::TTBCustomItem::Click
(005755F7) Tb2item::TTBCustomItem::ClickWndProc
(00234050) System::Classes::_18364
(00038CE1) USER32.dll
(00027D88) USER32.dll
(00027A73) USER32.dll
(000271E4) UXTHEME.DLL
(000271EF) UXTHEME.DLL
(00034D5D) USER32.dll
(0002782B) USER32.dll
(000329E7) USER32.dll
(00079604) ntdll.dll
(00057BE2) USER32.dll
(000A76B8) USER32.dll
(003C56A9) Vcl::Controls::FindVCLWindow
(004C02AD) Vcl::Menus::TPopupMenu::Popup
(003F3F88) Vcl::Stdctrls::TCustomButton::CNNotify
(00B7BAEB) TMessageButton::Dispatch
(003C9026) Vcl::Controls::TControl::WndProc
(00027A73) USER32.dll
(00027E89) USER32.dll
(000274F5) USER32.dll
(00040010) USER32.dll
(000282D2) USER32.dll
(003CE1D1) Vcl::Controls::TWinControl::WndProc
(0001357F) KERNEL32.DLL
(0007378F) USER32.dll
(0000025A) win32u.dll
(0002630F) USER32.dll
(003F27D8) Vcl::Stdctrls::TButtonControl::WndProc
(003C8C5C) Vcl::Controls::TControl::Perform
(003CE32B) Vcl::Controls::_17122
(003CEE11) Vcl::Controls::TWinControl::WMNotify
(00B7DED0) TMessageForm::Dispatch
(003C9026) Vcl::Controls::TControl::WndProc
(000382E7) ntdll.dll
(0003821F) ntdll.dll
(0006F48A) CoreMessaging.dll
(00038CE1) USER32.dll
(00027D88) USER32.dll
(00027E92) USER32.dll
(00027E22) USER32.dll
(00027A73) USER32.dll
(00027E89) USER32.dll
(003CE1D1) Vcl::Controls::TWinControl::WndProc
(004D23BD) Vcl::Forms::TCustomForm::WndProc
(003CE1D1) Vcl::Controls::TWinControl::WndProc
(004D23A8) Vcl::Forms::TCustomForm::WndProc
(00BD521F) C4923_0
(00BD5217) C4923_0
(00B7BAEB) TMessageButton::Dispatch
(003C9026) Vcl::Controls::TControl::WndProc
(0016A8FC) System::TMonitor::TryEnter
(0016A424) System::TMonitor::Enter
(0016A28C) System::TMonitor::CheckOwningThread
(0016A5B2) System::TMonitor::Exit
(003AEB29) Vcl::Graphics::FreeMemoryContexts
(0016A8FC) System::TMonitor::TryEnter
(0016A424) System::TMonitor::Enter
(0016A28C) System::TMonitor::CheckOwningThread
(0016A5B2) System::TMonitor::Exit
(0016A8FC) System::TMonitor::TryEnter
(0016A5B2) System::TMonitor::Exit
(0016A60E) System::TMonitor::Exit
(003CD6DC) Vcl::Controls::TWinControl::MainWndProc
(00234050) System::Classes::_18364
(00038CE1) USER32.dll
(00027D88) USER32.dll
(00027A73) USER32.dll
(00234050) System::Classes::_18364
(00038CE1) USER32.dll
(0002782B) USER32.dll
(000329E7) USER32.dll
(0002782B) USER32.dll
(00079604) ntdll.dll
(000001EA) win32u.dll
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I know how to reproduce the problem or the problem happens frequently enough. I wish to be contacted by the WinSCP team to help resolving the problem.