<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 5.7.7

Error message:
Invalid access to memory.

Stack trace:
(007E0326)
(00062496) ntdll.dll
(0000F13E) ntdll.dll.KiUserExceptionDispatcher
(00056E2E)

Status: unknown_rel_addr

The problem happens rarely. I cannot reproduce it.