Invalid access to memory - _count234

<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 6.3.4

Error message:
Invalid access to memory.

Stack trace:
(00ADAE55) C4032_0
(00E22DAE) C6612_0
(00E24E16) ____ExceptionHandler
(00E21BD0) __ExceptionHandler
(00098CCF) ntdll.dll
(000781E1) ntdll.dll.KiUserExceptionDispatcher
(00AD72A0) _count234
(00AD77A7) _add234
(00ADC3BE) _sk_addr_dup
(00ADC4C1) _sk_new
(00AAB58A) _new_connection
(00AC1467) _ssh_sw_abort_deferred
(00AC1743) _ssh_is_bare
(00BC375F) TSecureShell::Open
(00C5D1AD) TTerminal::Open
(00B79F60) TTerminalItem::ProcessEvent
(00B782CC) TSignalThread::Execute
(000D246B) Userinterface::C20_0
(00016BA7) KERNEL32.DLL.BaseThreadInitThunk
(0006B109) ntdll.dll
(0006B08A) ntdll.dll

(00E23419) C6612_0
(00E249F3) _ReThrowException
(00BC3948) TSecureShell::Open
(00C5D1AD) TTerminal::Open
(00B79F60) TTerminalItem::ProcessEvent
(00B782CC) TSignalThread::Execute
(000D246B) Userinterface::C20_0
(00016BA7) KERNEL32.DLL.BaseThreadInitThunk
(0006B109) ntdll.dll
(0006B08A) ntdll.dll

(00E23419) C6612_0
(00E249F3) _ReThrowException
(00C5D355) TTerminal::Open
(00B79F60) TTerminalItem::ProcessEvent
(00B782CC) TSignalThread::Execute
(000D246B) Userinterface::C20_0
(00016BA7) KERNEL32.DLL.BaseThreadInitThunk
(0006B109) ntdll.dll
(0006B08A) ntdll.dll

(00E23419) C6612_0
(00E249F3) _ReThrowException
(00C5D9C1) TTerminal::Open
(00B79F60) TTerminalItem::ProcessEvent
(00B782CC) TSignalThread::Execute
(000D246B) Userinterface::C20_0
(00016BA7) KERNEL32.DLL.BaseThreadInitThunk
(0006B109) ntdll.dll
(0006B08A) 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 6.3.5

Error message:
Accès mémoire invalide.

Trace de la pile :
(00ADB5E1) C4032_0
(00E24572) C6612_0
(00E265DA) ____ExceptionHandler
(00E23394) __ExceptionHandler
(00087FFF) ntdll.dll
(00074531) ntdll.dll.KiUserExceptionDispatcher
(00AD7A2C) _count234
(00AD7F33) _add234
(00ADCB4A) _sk_addr_dup
(00ADCC4D) _sk_new
(00AABD16) _new_connection
(00AC1BF3) _ssh_sw_abort_deferred
(00AC1ECF) _ssh_is_bare
(00BC4DC7) TSecureShell::Open
(00C5E811) TTerminal::Open
(00B7B5C8) TTerminalItem::ProcessEvent
(00B79934) TSignalThread::Execute
(000D246B) Userinterface::C20_0
(0001ECC7) KERNEL32.DLL.BaseThreadInitThunk
(000670CC) ntdll.dll.RtlGetAppContainerNamedObjectPath
(00067099) ntdll.dll.RtlGetAppContainerNamedObjectPath

(00E24BDD) C6612_0
(00E261B7) _ReThrowException
(00BC4FB0) TSecureShell::Open
(00C5E811) TTerminal::Open
(00B7B5C8) TTerminalItem::ProcessEvent
(00B79934) TSignalThread::Execute
(000D246B) Userinterface::C20_0
(0001ECC7) KERNEL32.DLL.BaseThreadInitThunk
(000670CC) ntdll.dll.RtlGetAppContainerNamedObjectPath
(00067099) ntdll.dll.RtlGetAppContainerNamedObjectPath

(00E24BDD) C6612_0
(00E261B7) _ReThrowException
(00C5E9B9) TTerminal::Open
(00B7B5C8) TTerminalItem::ProcessEvent
(00B79934) TSignalThread::Execute
(000D246B) Userinterface::C20_0
(0001ECC7) KERNEL32.DLL.BaseThreadInitThunk
(000670CC) ntdll.dll.RtlGetAppContainerNamedObjectPath
(00067099) ntdll.dll.RtlGetAppContainerNamedObjectPath

(00E24BDD) C6612_0
(00E261B7) _ReThrowException
(00C5F025) TTerminal::Open
(00B7B5C8) TTerminalItem::ProcessEvent
(00B79934) TSignalThread::Execute
(000D246B) Userinterface::C20_0
(0001ECC7) KERNEL32.DLL.BaseThreadInitThunk
(000670CC) ntdll.dll.RtlGetAppContainerNamedObjectPath
(00067099) ntdll.dll.RtlGetAppContainerNamedObjectPath

The problem happens rarely. I cannot reproduce it.