<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 5.17.7

Error message:
Invalid access to memory.

Stack trace:
(004171A4)
(00F8862A)
(00F8A692)
(00F8744C)
(00088F2F) ntdll.dll
(000743C1) ntdll.dll.KiUserExceptionDispatcher
(001028EA)
(00002658)
(00F8663D)
(00067942) ntdll.dll.RtlGetAppContainerNamedObjectPath
(0006790F) ntdll.dll.RtlGetAppContainerNamedObjectPath

Status: unknown_rel_addr

The problem happens rarely. I cannot reproduce it.