Invalid access to memory - _get_ssh_version

<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 5.8.3

Error message:
Invalid access to memory.

Stack trace:
(006225DE) _get_ssh_version
(008594BA) C5073_0
(0085B522) ____ExceptionHandler
(008582DC) __ExceptionHandler
(0008A61F) ntdll.dll
(00077E7A) ntdll.dll.KiUserExceptionDispatcher
(006EBF5F) TSecureShell::GetSessionInfo
(006EDCFE) TSecureShell::Open
(0072B89F) TSFTPFileSystem::Open
(007661C7) TTerminal::Reopen
(006BE061) TTerminalThread::TerminalReopenEvent
(006B9028) TSignalThread::Execute
(00097443) Userinterface::C20_0
(000128F2) KERNEL32.DLL.BaseThreadInitThunk
(00064DE1) ntdll.dll
(00064DA9) ntdll.dll

(00859B25) C5073_0
(0085B0FF) _ReThrowException
(00764EB9) TTerminal::Open
(007661C7) TTerminal::Reopen
(006BE061) TTerminalThread::TerminalReopenEvent
(006B9028) TSignalThread::Execute
(00097443) Userinterface::C20_0
(000128F2) KERNEL32.DLL.BaseThreadInitThunk
(00064DE1) ntdll.dll
(00064DA9) ntdll.dll

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 5.8.4

Error message:
Naruszenie ochrony pamęci.

Stack trace:
(006294EA) _get_ssh_version
(00861DD6) C5073_3
(00863E3E) ____ExceptionHandler
(00860BF8) __ExceptionHandler
(00062496) ntdll.dll
(0000F13E) ntdll.dll.KiUserExceptionDispatcher
(006F369F) TSecureShell::GetSessionInfo
(006F543E) TSecureShell::Open
(007332FF) TSFTPFileSystem::Open
(0076DC27) TTerminal::Reopen
(006C5681) TTerminalThread::TerminalReopenEvent
(006C0648) TSignalThread::Execute
(00098247) Userinterface::C20_0
(00012388) kernel32.dll.BaseThreadInitThunk
(00038900) ntdll.dll
(000388D0) ntdll.dll

(00862441) C5073_3
(00863A1B) _ReThrowException
(0076C919) TTerminal::Open
(0076DC27) TTerminal::Reopen
(006C5681) TTerminalThread::TerminalReopenEvent
(006C0648) TSignalThread::Execute
(00098247) Userinterface::C20_0
(00012388) kernel32.dll.BaseThreadInitThunk
(00038900) ntdll.dll
(000388D0) ntdll.dll

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 5.9.2

Error message:
Zugriffsverletzung - ungültiger Zugriff auf den Speicher.

Stack trace:
(0062A272) _get_ssh_version
(00863846) C5073_3
(008658AE) ____ExceptionHandler
(00862668) __ExceptionHandler
(0008A61F) ntdll.dll
(00077E7A) ntdll.dll.KiUserExceptionDispatcher
(006F4EDB) TSecureShell::GetSessionInfo
(006F6CD2) TSecureShell::Open
(007348FB) TSFTPFileSystem::Open
(0076F49F) TTerminal::Reopen
(006C6A2D) TTerminalThread::TerminalReopenEvent
(006C19F4) TSignalThread::Execute
(000987A7) Userinterface::C20_0
(000128F2) KERNEL32.DLL.BaseThreadInitThunk
(00064DE1) ntdll.dll
(00064DA9) ntdll.dll

(00863EB1) C5073_3
(0086548B) _ReThrowException
(0076DF15) TTerminal::Open
(0076F49F) TTerminal::Reopen
(006C6A2D) TTerminalThread::TerminalReopenEvent
(006C19F4) TSignalThread::Execute
(000987A7) Userinterface::C20_0
(000128F2) KERNEL32.DLL.BaseThreadInitThunk
(00064DE1) ntdll.dll
(00064DA9) ntdll.dll

The problem happens rarely. I cannot reproduce it.