<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)>

WinSCP 5.20.2

Error message:
Invalid access to memory.

Stack trace:
(0008784F) ntdll.dll
(00073EC1) ntdll.dll.KiUserExceptionDispatcher
(0027F5A5) Vcl::Controls::TWinControl::DestroyHandle
(0046EB6A) Customdriveview::TCustomDriveView::CMRecreateWnd
(0027B831) Vcl::Controls::TControl::WndProc
(00280375) Vcl::Controls::TWinControl::WndProc
(002B66C6) Vcl::Comctrls::TCustomTreeView::WndProc
(0027F5C6) Vcl::Controls::TWinControl::RecreateWnd
(00280375) Vcl::Controls::TWinControl::WndProc

The problem happens rarely. I cannot reproduce it.