<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 5.15.2

Error message:
Ошибка доступа к памяти.

Трассировка стека:
(004176D3) System::DoneExcept
(0008402F) ntdll.dll
(00071931) ntdll.dll.KiUserExceptionDispatcher
(003A3BA8) System::Classes::_18201
(00045359) USER32.dll
(00036297) USER32.dll
(000353D6) USER32.dll
(000351AB) USER32.dll.DispatchMessageW

(004172C0) System::HandleAnyException
(0008402F) ntdll.dll
(00071931) ntdll.dll.KiUserExceptionDispatcher
(003A3BA8) System::Classes::_18201
(00045359) USER32.dll
(00036297) USER32.dll
(000353D6) USER32.dll
(000351AB) USER32.dll.DispatchMessageW

Status: all_insignificant

The problem happens rarely. I cannot reproduce it.