<Try to describe precise steps that lead to the problem (where do you click, what keys do you press, what do you see, etc.)>
I was playing with Raspberry pi and unstable power supplies. No idea how to reproduce!
<If relevant, consider attaching a session log file or a screenshot)>

WinSCP 5.17.10

Error message:
Invalid access to memory.

Stack trace:
(00419098) System::HandleAnyException
(0008771F) ntdll.dll
(000740A1) ntdll.dll.KiUserExceptionDispatcher
(003A5978) System::Classes::_18201
(0003DF59) USER32.dll
(00034EC5) USER32.dll
(00032C35) USER32.dll
(000329FB) USER32.dll.DispatchMessageW

Status: all_insignificant

The problem happens rarely. I cannot reproduce it.