Error listing directory '/' - _ne_sspi_create_context

when I try to log on to an FTP server at ITU.int and after I enter my username and password, the following window pops up.

Invalid access to memory.

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WinSCP 5.9.5

Error message:
Error listing directory '/'.

Invalid access to memory.

Stack trace:
(00855F28) C3463_0
(0086700E) C5073_3
(00869076) ____ExceptionHandler
(00865E30) __ExceptionHandler
(000851CF) ntdll.dll
(00073161) ntdll.dll.KiUserExceptionDispatcher
(00608F3C) _ne_sspi_create_context
(005FF6FF) C2373_0
(005FF787) C2373_0
(00600A2B) C2373_0
(00600DB5) C2373_0
(00604F18) _ne_end_request
(0060506E) _ne_request_dispatch
(0060BE03) _ne_propfind_get_request
(0060BEE7) _ne_propfind_allprop
(00790247) TWebDAVFileSystem::ReadDirectoryInternal
(0079043E) TWebDAVFileSystem::ReadDirectory
(00778643) TTerminal::CustomReadDirectory
(00777BD1) TTerminal::ReadDirectory
(00777050) TTerminal::ReloadDirectory
(006551D4) TUnixDirView::ReloadDirectory
(00038277) TNonVisualDataModule::ExplorerActionsExecute
(003B5388) System::Actions::TContainedActionList::ExecuteAction
(0019C501) Vcl::Actnlist::TCustomAction::Execute
(0037326C) System::Classes::_18201
(00031B59) USER32.dll
(000240EE) USER32.dll
(00023A7D) USER32.dll
(0002384B) USER32.dll.DispatchMessageW

(00867679) C5073_3
(00868C53) _ReThrowException
(00778672) TTerminal::CustomReadDirectory
(00777BD1) TTerminal::ReadDirectory
(00777050) TTerminal::ReloadDirectory
(006551D4) TUnixDirView::ReloadDirectory
(00038277) TNonVisualDataModule::ExplorerActionsExecute
(003B5388) System::Actions::TContainedActionList::ExecuteAction
(0019C501) Vcl::Actnlist::TCustomAction::Execute
(0037326C) S

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.

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