Invalid access to memory - TTerminal::PeekCurrentDirectory

<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 6.1.2

Error message:
Invalid access to memory.

Stack trace:
(00DFCFAF) TTerminal::PeekCurrentDirectory
(0008792F) ntdll.dll
(00073F81) ntdll.dll.KiUserExceptionDispatcher
(00022178) TCustomScpExplorerForm::UpdateSessionData
(000220E3) TCustomScpExplorerForm::UpdateSession
(00021AC7) TCustomScpExplorerForm::DoCollectWorkspace
(0002E248) TCustomScpExplorerForm::FormClose
(003B05C7) Vcl::Forms::TCustomForm::DoClose
(003F6B91) Vcl::Controls::TWinControl::WndProc
(003B10A0) Vcl::Forms::TCustomForm::WndProc

The problem happens rarely. I cannot reproduce it.

<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 6.1.2

Error message:
Ошибка доступа к памяти.

Трассировка стека:
(00DFCFAF) TTerminal::PeekCurrentDirectory
(00087A7F) ntdll.dll
(000740D1) ntdll.dll.KiUserExceptionDispatcher
(00022178) TCustomScpExplorerForm::UpdateSessionData
(000220E3) TCustomScpExplorerForm::UpdateSession
(00007E80) TCustomScpExplorerForm::SessionChanging
(000BE8EF) TTerminalManager::DoSetActiveSession
(000BE840) TTerminalManager::SetActiveSession
(0001BD8E) TCustomScpExplorerForm::NewSession
(0001BDD7) TCustomScpExplorerForm::NewTab
(0002408B) TCustomScpExplorerForm::SessionTabSwitched
(00024108) TCustomScpExplorerForm::SessionsPageControlChange
(00423409) Vcl::Comctrls::TCustomTabControl::Change
(003F6B91) Vcl::Controls::TWinControl::WndProc
(003F1C88) Vcl::Controls::TControl::Perform
(003F6CF7) Vcl::Controls::_17076
(003F6B91) Vcl::Controls::TWinControl::WndProc
(003B10A0) Vcl::Forms::TCustomForm::WndProc

The problem happens rarely. I cannot reproduce it.

<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 6.3.3

Error message:
Nieprawidłowy dostęp do pamięci.

Stack trace:
(00C62ED3) TTerminal::PeekCurrentDirectory
(00087B9F) ntdll.dll
(00074121) ntdll.dll.KiUserExceptionDispatcher
(00022E08) TCustomScpExplorerForm::UpdateSessionData
(00022D73) TCustomScpExplorerForm::UpdateSession
(00022757) TCustomScpExplorerForm::DoCollectWorkspace
(0002F19C) TCustomScpExplorerForm::FormClose
(003C2ECB) Vcl::Forms::TCustomForm::DoClose
(0002C8E4) TCustomScpExplorerForm::Dispatch
(00404951) Vcl::Controls::TControl::WndProc
(00409495) Vcl::Controls::TWinControl::WndProc
(003C39A4) Vcl::Forms::TCustomForm::WndProc

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.

@apl: 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.

I access through Open VPN my distant Ubuntu Server.
I cannot access with the usual logon, when I try to open anther link with another user, the pb. occurs. I have tried to uninstall WinSCP and reinstall, no change (It seems desinstall does not fully remove WinSCP ini or config data).
Kind Regards,
Charles.
<If relevant, consider attaching a session log file or a screenshot)>

WinSCP 6.3.5

Error message:
Accès mémoire invalide.

Trace de la pile :
(00C64C2F) TTerminal::PeekCurrentDirectory
(00098D8F) ntdll.dll
(000781B1) ntdll.dll.KiUserExceptionDispatcher
(00022E08) TCustomScpExplorerForm::UpdateSessionData
(00022D73) TCustomScpExplorerForm::UpdateSession
(000089BC) TCustomScpExplorerForm::SessionChanging
(000C29CD) TTerminalManager::UpdateScpExplorer
(000C2B11) TTerminalManager::DoSetActiveSession
(000C2A48) TTerminalManager::SetActiveSession
(000568B6) TNonVisualDataModule::SessionItemClick
(00226F2C) System::Classes::_18201
(00032161) USER32.dll
(00022F51) USER32.dll
(00021810) USER32.dll
(0002135B) 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.

@charles.anres: 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.