<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 5.7.4

Error message:
External exception C0000006

Stack trace:
(003AEF89)
(0005A67A) ntdll.dll
(0000F15E) ntdll.dll.KiUserExceptionDispatcher
(0032F92F)

Status: unknown_rel_addr

The problem happens rarely. I cannot reproduce it.