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.

<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 5.13.9

Error message:
メモリのアクセス違反

スタック トレース:
(0001C8E8) TCustomScpExplorerForm::GetSessionTabTerminal
(008BFA86) C5105_3
(008C1AEE) ____ExceptionHandler
(008BE8A8) __ExceptionHandler
(00083FFF) ntdll.dll
(00071931) ntdll.dll.KiUserExceptionDispatcher
(00005EF4) TCustomScpExplorerForm::TerminalChanged
(00005DDA) TCustomScpExplorerForm::DoSetTerminal
(00005D8A) TCustomScpExplorerForm::SetTerminal
(000963F8) TTerminalManager::ConnectActiveTerminal
(00096C7C) TTerminalManager::DoSetActiveTerminal
(00096A06) TTerminalManager::SetActiveTerminal
(0001C3C9) TCustomScpExplorerForm::NeedSession
(00023F5C) TCustomScpExplorerForm::CMShowingChanged
(00023DC6) TCustomScpExplorerForm::Dispatch
(0025BDED) Vcl::Controls::TWinControl::WndProc
(002162B4) Vcl::Forms::TCustomForm::WndProc
(0085DDBC) Vclcommon::C2790_0

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.