<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

Error message:
メモリのアクセス違反

スタック トレース:
(0032FBF0) System::Internal::Strhlpr::UnicodeAssign
(008B9FD2) C5101_3
(008BC03A) ____ExceptionHandler
(008B8DF4) __ExceptionHandler
(0007CD1F) ntdll.dll
(0006A9B1) ntdll.dll.KiUserExceptionDispatcher
(0075FFF4) TSessionData::GetNameWithoutHiddenPrefix
(00760106) TSessionData::HasSessionName
(007601CA) TSessionData::GetSessionName
(00097716) TTerminalManager::TerminalTitle
(000977CB) TTerminalManager::GetActiveTerminalTitle
(00094EA8) TTerminalManager::UpdateAppTitle
(00094BC0) TTerminalManager::DoSetActiveTerminal
(00094B86) TTerminalManager::SetActiveTerminalWithAutoReconnect
(0006609D) TEditorManager::CheckFileChange
(0006412A) TEditorManager::Check
(00017531) TCustomScpExplorerForm::Idle
(0003DFD7) TNonVisualDataModule::DoIdle
(0003DF94) TNonVisualDataModule::SessionIdleTimerTimer
(0037ED14) System::Classes::_18201
(0003AE69) USER32.dll
(00037335) USER32.dll
(00036BE9) USER32.dll
(000369CB) USER32.dll.DispatchMessageW

(008BA63D) C5101_3
(008BBC17) _ReThrowException
(000660BF) TEditorManager::CheckFileChange
(0006412A) TEditorManager::Check
(00017531) TCustomScpExplorerForm::Idle
(0003DFD7) TNonVisualDataModule::DoIdle
(0003DF94) TNonVisualDataModule::SessionIdleTimerTimer
(0037ED14) System::Classes::_18201
(0003AE69) USER32.dll
(00037335) USER32.dll
(00036BE9) USER32.dll
(000369CB) USER32.dll.DispatchMessageW

(0076E589) TSessionLog::Add
(0007CD1F) ntdll.dll
(0006A9B1) ntdll.dll.KiUserExceptionDispatcher
(0076E771) TSessionLog::AddException
(007B5D4C) TTerminal::ShowExtendedException
(0021D912) Vcl::Forms::TApplication::HandleException
(0037ED14) System::Classes::_18201
(0003AE69) USER32.dll
(00037335) USER32.dll
(00036BE9) USER32.dll
(000369CB) USER32.dll.DispatchMessageW

(0076E589) TSessionLog::Add
(008B9FD2) C5101_3
(008BC03A) ____ExceptionHandler
(008B8DF4) __ExceptionHandler
(0007CD1F) ntdll.dll
(0006A9B1) ntdll.dll.KiUserExceptionDispatcher
(0076E771) TSessionLog::AddException
(007B5D4C) TTerminal::ShowExtendedException
(0021D912) Vcl::Forms::TApplication::HandleException
(000E2402) Execute
(000024A8) wWinMain
(008B8009) C4969_0
(00061EBE) ntdll.dll.RtlValidSecurityDescriptor
(00061E8B) ntdll.dll.RtlValidSecurityDescriptor

The problem happens rarely. I cannot reproduce it.