Invalid access to memory - TCustomScpExplorerForm::UpdateSessionTab

<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 5.17.10

Error message:
Invalid access to memory.

Stack trace:
(00020DE0) TCustomScpExplorerForm::UpdateSessionTab
(000861AF) ntdll.dll
(00072B31) ntdll.dll.KiUserExceptionDispatcher
(00021E67) TCustomScpExplorerForm::InactiveTerminalException
(000AF884) TTerminalManager::Idle
(00018C91) TCustomScpExplorerForm::Idle
(00049B2B) TNonVisualDataModule::DoIdle
(00049AE8) TNonVisualDataModule::SessionIdleTimerTimer
(003A5978) System::Classes::_18201
(0003DF59) USER32.dll
(00034EC5) USER32.dll
(00032C35) USER32.dll
(000329FB) USER32.dll.DispatchMessageW

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 5.19.1

Error message:
Invalid access to memory.

Stack trace:
(00021408) TCustomScpExplorerForm::UpdateSessionTab
(00FBC006) C5294_3
(00FBE06E) ____ExceptionHandler
(00FBAE28) __ExceptionHandler
(0008788F) ntdll.dll
(00073EC1) ntdll.dll.KiUserExceptionDispatcher
(000223D1) TCustomScpExplorerForm::TerminalReady
(000B07E2) TTerminalManager::ReconnectActiveTerminal
(00019AA9) TCustomScpExplorerForm::ReconnectSession
(0040B3CC) System::Actions::TContainedActionList::ExecuteAction
(001CD4B9) Vcl::Actnlist::TCustomAction::Execute
(003C79CC) System::Classes::_18201
(0003DEB9) USER32.dll
(00034E75) USER32.dll
(00032BE5) USER32.dll
(000329AB) 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.

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 5.19.4

Error message:
Acceso a memoria no válido

Traza de la pila:
(00021418) TCustomScpExplorerForm::UpdateSessionTab
(00FC3FFE) C5294_3
(00FC6066) ____ExceptionHandler
(00FC2E20) __ExceptionHandler
(0008510F) ntdll.dll
(000725C1) ntdll.dll.KiUserExceptionDispatcher
(000223E1) TCustomScpExplorerForm::TerminalReady
(000B045C) TTerminalManager::DisconnectActiveTerminalIfPermanentFreeOtherwise
(00022360) TCustomScpExplorerForm::ShowExtendedException
(000B1EF1) TTerminalManager::TerminalShowExtendedException
(00DC7054) TTerminal::ShowExtendedException
(0024425E) Vcl::Forms::TApplication::HandleException
(00108DBB) Execute
(00002658) wWinMain
(00FC2011) __wstartup
(00066082) ntdll.dll.RtlGetAppContainerNamedObjectPath
(0006604F) ntdll.dll.RtlGetAppContainerNamedObjectPath

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 5.19.5

Error message:
Invalid access to memory.

Stack trace:
(00021488) TCustomScpExplorerForm::UpdateSessionTab
(00FC4482) C5294_3
(00FC64EA) ____ExceptionHandler
(00FC32A4) __ExceptionHandler
(000878AF) ntdll.dll
(00073EE1) ntdll.dll.KiUserExceptionDispatcher
(00022451) TCustomScpExplorerForm::TerminalReady
(000B0946) TTerminalManager::ReconnectActiveTerminal
(000C2D1F) ShowExtendedExceptionEx
(000223D0) TCustomScpExplorerForm::ShowExtendedException
(000B1FBD) TTerminalManager::TerminalShowExtendedException
(00DC74D8) TTerminal::ShowExtendedException
(0024432A) Vcl::Forms::TApplication::HandleException
(003C7B64) System::Classes::_18201
(00042399) USER32.dll
(00039335) USER32.dll
(00037095) USER32.dll
(00036E5B) USER32.dll.DispatchMessageW

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 5.21.5

Error message:
Accesso alla memoria non valido.

Stack trace:
(000224F8) TCustomScpExplorerForm::UpdateSessionTab
(00097C6F) ntdll.dll
(00077BA1) ntdll.dll.KiUserExceptionDispatcher
(000234C1) TCustomScpExplorerForm::TerminalReady
(000B3414) TTerminalManager::DisconnectActiveTerminalIfPermanentFreeOtherwise
(00023440) TCustomScpExplorerForm::ShowExtendedException
(000B4EE5) TTerminalManager::TerminalShowExtendedException
(00DDBD58) TTerminal::ShowExtendedException
(002463D2) Vcl::Forms::TApplication::HandleException
(003C9C0C) System::Classes::_18201
(00031411) USER32.dll
(000221D1) USER32.dll
(00021B42) USER32.dll.CallWindowProcW
(004A18CB) Dragdrop::TDragDrop::WndMethod
(003C9C0C) System::Classes::_18201
(00031411) USER32.dll
(000221D1) USER32.dll
(00020A90) USER32.dll
(000205DB) USER32.dll.DispatchMessageW

The problem happens rarely. I cannot reproduce it.