Invalid access to memory - System::Internal::Strhlpr::UnicodeEqual

<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 5.11.3

Error message:
Invalid access to memory.

Stack trace:
(0032CBB6) System::Internal::Strhlpr::UnicodeEqual
(0089D34A) C5067_0
(0089F3B2) ____ExceptionHandler
(0089C16C) __ExceptionHandler
(00088D5F) ntdll.dll
(0006FC11) ntdll.dll.KiUserExceptionDispatcher
(0074529E) TSessionData::SetRemoteDirectory
(00093282) TTerminalManager::DoConnectTerminal
(000933C8) TTerminalManager::ConnectActiveTerminalImpl
(000934EC) TTerminalManager::ConnectActiveTerminal
(00093D70) TTerminalManager::DoSetActiveTerminal
(00093AFA) TTerminalManager::SetActiveTerminal
(0001BF79) TCustomScpExplorerForm::NeedSession
(000233C8) TCustomScpExplorerForm::CMShowingChanged
(00023232) TCustomScpExplorerForm::Dispatch
(00257CC9) Vcl::Controls::TWinControl::WndProc
(00212190) Vcl::Forms::TCustomForm::WndProc
(0083C1D0) Vclcommon::C2751_0

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 5.21.3

Error message:
Accès mémoire invalide.

Trace de la pile :
(003797F2) System::Internal::Strhlpr::UnicodeEqual
(00FD2216) C5412_3
(00FD427E) ____ExceptionHandler
(00FD1038) __ExceptionHandler
(00087AFF) ntdll.dll
(00073FA1) ntdll.dll.KiUserExceptionDispatcher
(00D7BCDE) TSessionData::SetRemoteDirectory
(000B3147) TTerminalManager::DoConnectTerminal
(000B334E) TTerminalManager::ConnectActiveTerminalImpl
(000B34BB) TTerminalManager::ConnectActiveTerminal
(000B3DFC) TTerminalManager::DoSetActiveTerminal
(000B3B2A) TTerminalManager::SetActiveTerminal
(00021F52) TCustomScpExplorerForm::NeedSession
(0002A0FB) TCustomScpExplorerForm::CMShowingChanged
(00029ECF) TCustomScpExplorerForm::Dispatch
(00282479) Vcl::Controls::TWinControl::WndProc
(0023C940) Vcl::Forms::TCustomForm::WndProc
(00E8B198) Vclcommon::C3109_0

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 5.21.6

Error message:
Ошибка доступа к памяти.

Трассировка стека:
(0037980A) System::Internal::Strhlpr::UnicodeEqual
(00FDF74E) C5412_0
(00FE17B6) ____ExceptionHandler
(00FDE570) __ExceptionHandler
(0003EE3E) ntdll.dll.ZwWow64CallFunction64
(0003F5BA) ntdll.dll.KiUserExceptionDispatcher
(00D864EA) TSessionData::SetRemoteDirectory
(000B315F) TTerminalManager::DoConnectTerminal
(000B3366) TTerminalManager::ConnectActiveTerminalImpl
(000B34D3) TTerminalManager::ConnectActiveTerminal
(000B3E14) TTerminalManager::DoSetActiveTerminal
(000B3B42) TTerminalManager::SetActiveTerminal
(00021F5A) TCustomScpExplorerForm::NeedSession
(0002A123) TCustomScpExplorerForm::CMShowingChanged
(00029EF7) TCustomScpExplorerForm::Dispatch
(00282491) Vcl::Controls::TWinControl::WndProc
(0023C958) Vcl::Forms::TCustomForm::WndProc
(00E95D9C) Vclcommon::C3109_0

(00DDBEB7) TTerminal::ShowExtendedException
(00FDF74E) C5412_0
(00FE17B6) ____ExceptionHandler
(00FDE570) __ExceptionHandler
(0003EE3E) ntdll.dll.ZwWow64CallFunction64
(0003F5BA) ntdll.dll.KiUserExceptionDispatcher
(000B34D3) TTerminalManager::ConnectActiveTerminal
(000B3E14) TTerminalManager::DoSetActiveTerminal
(000B3B42) TTerminalManager::SetActiveTerminal
(00021F5A) TCustomScpExplorerForm::NeedSession
(0002A123) TCustomScpExplorerForm::CMShowingChanged
(00029EF7) TCustomScpExplorerForm::Dispatch
(00282491) Vcl::Cont

The problem happens rarely. I cannot reproduce it.