<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 5.17.10

Error message:
Invalid access to memory.

Stack trace:
(00CF44EE) TScript::LogPendingLines
(00F8A13A) C5296_0
(00F8C1A2) ____ExceptionHandler
(00F88F5C) C5252_4
(0008421F) ntdll.dll
(00071B21) ntdll.dll.KiUserExceptionDispatcher
(00CF6394) TScript::NotSupported
(00060012) TConsoleRunner::DoShowException
(0005FF84) TConsoleRunner::ShowException
(00101985) Execute
(00002658) wWinMain
(00F8814D) __thread_data_new
(000656DB) ntdll.dll.RtlGetAppContainerNamedObjectPath
(000656A8) ntdll.dll.RtlGetAppContainerNamedObjectPath

The problem happens rarely. I cannot reproduce it.