<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 5.9.5

Error message:
Érvénytelen memóriaelérés

Veremkivonat:
(00774CD9) TTerminal::GetUserNameW
(00045D46) ntdll.dll.RtlRaiseStatus
(00045BD2) ntdll.dll.KiUserExceptionDispatcher
(006D0AA6) TRemoteFile::GetIsInaccesibleDirectory
(00659617) TCustomUnixDriveView::UpdatePath
(00659B4D) TCustomUnixDriveView::LoadPathEasy
(006596CA) TCustomUnixDriveView::UpdatePath
(00659B4D) TCustomUnixDriveView::LoadPathEasy
(00659D43) TCustomUnixDriveView::LoadPath
(00659CBC) TCustomUnixDriveView::LoadPath
(00659CBC) TCustomUnixDriveView::LoadPath
(00659DEC) TCustomUnixDriveView::LoadDirectory
(0065614F) TUnixDirView::DoReadDirectoryImpl
(00005AC0) TCustomScpExplorerForm::SetTerminal
(0008E4F9) TTerminalManager::TerminalReady
(0008BC1A) TTerminalManager::SetActiveTerminal
(0001C09C) TCustomScpExplorerForm::SessionsPageControlChange
(0024F2A9) Vcl::Controls::TWinControl::WndProc
(0024A3A0) Vcl::Controls::TControl::Perform
(0024F40F) Vcl::Controls::_17076
(0024F2A9) Vcl::Controls::TWinControl::WndProc
(00209758) Vcl::Forms::TCustomForm::WndProc
(0080C7F8) Vclcommon::C2754_0
(0024E8F0) Vcl::Controls::TWinControl::MainWndProc
(0037326C) System::Classes::_18201
(0001B4B4) USER32.dll
(0001B5B2) USER32.dll
(00010AFC) USER32.dll
(00010B22) USER32.dll.CallWindowProcW
(0000B106) tv_w32.dll
(0001B4B4) USER32.dll
(0001B5B2) USER32.dll
(00013ED9) USER32.dll
(00013F4A) USER32.dll
(00045BAB) ntdll.dll.KiUserCallbackDispatcher
(0001454D) USER32.dll.SendMessageW

The problem happens rarely. I cannot reproduce it.