メモリのアクセス違反 - TCustomScpExplorerForm::GetSessionTabTerminal

<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:
メモリのアクセス違反

スタック トレース:
(0001C498) TCustomScpExplorerForm::GetSessionTabTerminal
(0089D34A) C5067_0
(0089F3B2) ____ExceptionHandler
(0089C16C) __ExceptionHandler
(0003EF0E) ntdll.dll.ZwWow64CallFunction64
(0003F68A) ntdll.dll.KiUserExceptionDispatcher
(00005B76) TCustomScpExplorerForm::TerminalChanged
(00005A84) TCustomScpExplorerForm::SetTerminal
(000962A5) TTerminalManager::TerminalReady
(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.