Thanks for your report.
I have sent you an email with a debug version of WinSCP to address you have used to register on this forum.

<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 5.7

Error message:
No puedo determinar el nombre del directorio remoto

Acceso a memoria no válido

Stack trace:
(0001F031) .[00440031]
[018F05DE] C4725_0
[018F2646] ____ExceptionHandler
[018EF5C0] __ExceptionHandler
[77BFB466] ntdll.dll
[77BB012E] ntdll.dll.KiUserExceptionDispatcher
[01820A1E] TTerminal::ReadCurrentDirectory
[0181C892] TTerminal::ReactOnCommand
[01723D53] TUnixDirView::ChangeDirectory
[01722216] TUnixDirView::ExecuteParentDirectory
[014E9FD0] Customdirview::TCustomDirView::Execute
[0132C755] Vcl::Controls::TWinControl::WndProc
[01370683] Vcl::Comctrls::TCustomListView::WndProc
[01450678] System::Classes::_18201
[771D62F7] USER32.dll
[771D6D35] USER32.dll
[771E0D22] USER32.dll
[771E0D48] USER32.dll.CallWindowProcW
[0150F24F] Dragdrop::TDragDrop::WndMethod
[01450678] System::Classes::_18201
[771D62F7] USER32.dll
[771D6D35] USER32.dll
[771D77BF] USER32.dll
[771D7885] USER32.dll.DispatchMessageW