<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 5.9.5

Error message:
Invalid access to memory.

Stack trace:
(00866A8A) _ssl3_send_certificate_request
(0003EF0E) ntdll.dll.ZwWow64CallFunction64
(0003F68A) ntdll.dll.KiUserExceptionDispatcher
(00061F4A) __tpdsc__ THistoryStrings *
(00010FDF) TCustomScpExplorerForm::CustomExecuteFile
(003B5440) System::Dateutils::_16967
(0019C56E) System::Generics::Collections::TList__1<int>::Reverse
(0020E3D6) Vcl::Forms::TApplication::
(0020E454) Vcl::Forms::TApplication::

The problem happens rarely. I cannot reproduce it.