Thanks for your report.
I have sent you an email with a debug version of WinSCP to the 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 5.7.7

Error message:
Erreur lors l'établissement du nom du répertoire distant.

Accès mémoire invalide.

Trace de la pile :
(0062F082) TConfiguration::LoadData
(007E08AA) C4799_0
(007E2912) ____ExceptionHandler
(007DF88C) __ExceptionHandler
(000A284F) ntdll.dll
(0009034A) ntdll.dll.KiUserExceptionDispatcher
(00714252) TTerminal::ReadCurrentDirectory
(00710206) TTerminal::ReactOnCommand
(00616007) TUnixDirView::ChangeDirectory
(006144B6) TUnixDirView::ExecuteParentDirectory
(003D9EB8) Customdirview::TCustomDirView::Execute
(0021C609) Vcl::Controls::TWinControl::WndProc
(00260537) Vcl::Comctrls::TCustomListView::WndProc
(0034059C) System::Classes::_18201
(00034D91) USER32.dll
(00018F35) USER32.dll
(00018806) USER32.dll.CallWindowProcW
(00098CBA) COMCTL32.DLL
(00098CA1) COMCTL32.DLL
(00098ADC) COMCTL32.DLL
(00034D91) USER32.dll
(00018F35) USER32.dll
(00018806) USER32.dll.CallWindowProcW
(003FF173) Dragdrop::TDragDrop::WndMethod
(0034059C) System::Classes::_18201
(00034D91) USER32.dll
(00018F35) USER32.dll
(00018A7B) USER32.dll
(000188CB) USER32.dll.DispatchMessageW

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.