Invalid access to memory - TTerminalQueueStatus::GetCount

<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 5.11.1

Error message:
Invalid access to memory.

Stack trace:
(006E0CFF) TTerminalQueueStatus::GetCount
(00057786) ntdll.dll
(0000F10A) ntdll.dll.KiUserExceptionDispatcher
(003BDD90) System::Actions::TContainedActionList::UpdateAction
(001A4E7E) Vcl::Actnlist::TCustomAction::Update
(00216CE6) Vcl::Forms::_16777
(00216CE6) Vcl::Forms::_16777
(00216D64) Vcl::Forms::TCustomForm::UpdateActions

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 5.15.3

Error message:
Invalid access to memory.

Stack trace:
(0074D5C7) TTerminalQueueStatus::GetCount
(0006248E) ntdll.dll
(0000F15E) ntdll.dll.KiUserExceptionDispatcher
(003E78DC) System::Actions::TContainedActionList::UpdateAction
(001C647A) Vcl::Actnlist::TCustomAction::Update
(002382E2) Vcl::Forms::_16777
(002382E2) Vcl::Forms::_16777
(00238360) Vcl::Forms::TCustomForm::UpdateActions

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)>

It froze at 97% completion of downloading a large directory. I saved the workspace and hope that it will resume after I restart the app.

WinSCP 5.21.7

Error message:
Invalid access to memory.

Stack trace:
(00D045CB) TTerminalQueueStatus::GetCount
(00087B7F) ntdll.dll
(00074001) ntdll.dll.KiUserExceptionDispatcher
(000B6344) TTerminalManager::DoConfigurationChange
(00CA2700) TConfiguration::Changed
(000E4D34) TWinConfiguration::SetAutoSaveWorkspace
(0004C04A) TNonVisualDataModule::ExplorerActionsExecute
(0040D640) System::Actions::TContainedActionList::ExecuteAction
(001CF72D) Vcl::Actnlist::TCustomAction::Execute
(003C9C40) System::Classes::_18201
(000400E9) USER32.dll
(000370A5) USER32.dll
(00034E15) USER32.dll
(00034BDB) 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.

@futuretechtoday: 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 6.1.2

Error message:
メモリのアクセス違反

スタック トレース:
(00D1EB27) TTerminalQueueStatus::GetCount
(00087A7F) ntdll.dll

The problem happens rarely. I cannot reproduce it.