<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 5.17

Error message:
Ошибка доступа к памяти.

Трассировка стека:
(00417C80) System::HandleAnyException
(00087D6F) ntdll.dll
(00073211) ntdll.dll.KiUserExceptionDispatcher
(003A4568) System::Classes::_18201
(000436C9) USER32.dll
(000250B7) USER32.dll
(00024209) USER32.dll
(00023FCB) USER32.dll.DispatchMessageW

Status: all_insignificant

The problem happens rarely. I cannot reproduce it.