<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

Error message:
External exception C0000006

Трассировка стека:
(003E1929)
(00045CC6) ntdll.dll.RtlRaiseStatus
(00045B52) ntdll.dll.KiUserExceptionDispatcher
(00361FEF)

Status: unknown_rel_addr

The problem happens rarely. I cannot reproduce it.