Thanks for your report.
I have sent you an email with a debug version of WinSCP to address you have used to register on this forum.

<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 5.7

Error message:
Invalid access to memory.

Stack trace:
(0071F069) WinSCP.exe.[00720069]
[773B6A86] ntdll.dll
[7738013E] ntdll.dll.KiUserExceptionDispatcher
[01ADED4A]
[01ADEADD]
[01AE7D52]
[019E3D53] @TUnixDirView@ChangeDirectory$qqr20System@UnicodeString
[019E2216] @TUnixDirView@ExecuteParentDirectory$qqrv