Thanks for your report.
I have sent you an email with a debug version of WinSCP to the 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 5.9.2

Error message:
Invalid access to memory.

Stack trace:
(0008C763)
(00045D46) ntdll.dll.RtlRaiseStatus
(00045BD2) ntdll.dll.KiUserExceptionDispatcher
(006C7BCD)
(006C51FD)
(00016C9A)
(0022569B)
(00372BEC)
(0001B4B4) USER32.dll
(0001B5B2) USER32.dll
(0001BBE4) USER32.dll
(0001BC3B) USER32.dll.DispatchMessageW

Status: unknown_rel_addr

I know how to reproduce the problem or the problem happens frequently enough. I wish to be contacted by the WinSCP team to help resolving the problem.