Invalid access to memory - TActionLog::RecordPendingActions

<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 5.21.1

Error message:
Invalid access to memory.

Stack trace:
(00D8FBC3) TActionLog::RecordPendingActions
(00FD0EE2) C5412_3
(00FD2F4A) ____ExceptionHandler
(00FCFD04) __ExceptionHandler
(00087ACF) ntdll.dll
(00073FA1) ntdll.dll.KiUserExceptionDispatcher
(00DED669) TTerminal::Sink
(00DEC3B0) TTerminal::SinkRobust
(00DEC1D8) TTerminal::DoCopyToLocal
(00DBD43A) TSFTPFileSystem::CopyToLocal
(00DE8AC3) TTerminal::CopyToParallel
(00CF938B) TParallelTransferQueueItem::DoExecute
(00CF7D1E) TQueueItem::Execute
(00CF6D4E) TTerminalItem::ProcessEvent
(00CF5094) TSignalThread::Execute
(000C157B) Userinterface::C20_0
(0001F0C7) KERNEL32.DLL.BaseThreadInitThunk
(00066B4C) ntdll.dll.RtlGetAppContainerNamedObjectPath
(00066B19) ntdll.dll.RtlGetAppContainerNamedObjectPath

(00FD154D) C5412_3
(00FD2B27) _ReThrowException
(00DEC442) TTerminal::SinkRobust
(00DEC1D8) TTerminal::DoCopyToLocal
(00DBD43A) TSFTPFileSystem::CopyToLocal
(00DE8AC3) TTerminal::CopyToParallel
(00CF938B) TParallelTransferQueueItem::DoExecute
(00CF7D1E) TQueueItem::Execute
(00CF6D4E) TTerminalItem::ProcessEvent
(00CF5094) TSignalThread::Execute
(000C157B) Userinterface::C20_0
(0001F0C7) KERNEL32.DLL.BaseThreadInitThunk
(00066B4C) ntdll.dll.RtlGetAppContainerNamedObjectPath
(00066B19) 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 6.1.1

Error message:
Unzulässiger Zugriff auf einen Speicherbereich.

Stapelverfolgung:
(00DB7B2B) TActionLog::RecordPendingActions
(0100350E) C6083_0
(01005576) ____ExceptionHandler
(01002330) __ExceptionHandler
(00087A5F) ntdll.dll
(00073F81) ntdll.dll.KiUserExceptionDispatcher
(00E18CCD) TTerminal::Sink
(00E17A18) TTerminal::SinkRobust
(00E17840) TTerminal::DoCopyToLocal
(00DE79A2) TSFTPFileSystem::CopyToLocal
(00E14023) TTerminal::CopyToParallel
(00D1F257) TParallelTransferQueueItem::DoExecute
(00D1DBE6) TQueueItem::Execute
(00D1CC16) TTerminalItem::ProcessEvent
(00D1AF4C) TSignalThread::Execute
(000CD83B) Userinterface::C20_0
(0001F0C7) KERNEL32.DLL.BaseThreadInitThunk
(00066B1C) ntdll.dll.RtlGetAppContainerNamedObjectPath
(00066AE9) ntdll.dll.RtlGetAppContainerNamedObjectPath

(01003B79) C6083_0
(01005153) _ReThrowException
(00E17AAA) TTerminal::SinkRobust
(00E17840) TTerminal::DoCopyToLocal
(00DE79A2) TSFTPFileSystem::CopyToLocal
(00E14023) TTerminal::CopyToParallel
(00D1F257) TParallelTransferQueueItem::DoExecute
(00D1DBE6) TQueueItem::Execute
(00D1CC16) TTerminalItem::ProcessEvent
(00D1AF4C) TSignalThread::Execute
(000CD83B) Userinterface::C20_0
(0001F0C7) KERNEL32.DLL.BaseThreadInitThunk
(00066B1C) ntdll.dll.RtlGetAppContainerNamedObjectPath
(00066AE9) 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 6.1.2

Error message:
Unzulässiger Zugriff auf einen Speicherbereich.

Stapelverfolgung:
(00DB83EB) TActionLog::RecordPendingActions
(01003DEA) C6083_0
(01005E52) ____ExceptionHandler
(01002C0C) __ExceptionHandler
(00087A7F) ntdll.dll
(000740D1) ntdll.dll.KiUserExceptionDispatcher
(00E1958D) TTerminal::Sink
(00E182D8) TTerminal::SinkRobust
(00E18100) TTerminal::DoCopyToLocal
(00DE8262) TSFTPFileSystem::CopyToLocal
(00E148E3) TTerminal::CopyToParallel
(00D1FB17) TParallelTransferQueueItem::DoExecute
(00D1E4A6) TQueueItem::Execute
(00D1D4D6) TTerminalItem::ProcessEvent
(00D1B80C) TSignalThread::Execute
(000CE0EF) Userinterface::C20_0
(0001ECC7) KERNEL32.DLL.BaseThreadInitThunk
(00066C6C) ntdll.dll.RtlGetAppContainerNamedObjectPath
(00066C39) ntdll.dll.RtlGetAppContainerNamedObjectPath

(01004455) C6083_0
(01005A2F) _ReThrowException
(00E1836A) TTerminal::SinkRobust
(00E18100) TTerminal::DoCopyToLocal
(00DE8262) TSFTPFileSystem::CopyToLocal
(00E148E3) TTerminal::CopyToParallel
(00D1FB17) TParallelTransferQueueItem::DoExecute
(00D1E4A6) TQueueItem::Execute
(00D1D4D6) TTerminalItem::ProcessEvent
(00D1B80C) TSignalThread::Execute
(000CE0EF) Userinterface::C20_0
(0001ECC7) KERNEL32.DLL.BaseThreadInitThunk
(00066C6C) ntdll.dll.RtlGetAppContainerNamedObjectPath
(00066C39) ntdll.dll.RtlGetAppContainerNamedObjectPath

The problem happens rarely. I cannot reproduce it.