<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:
Invalid access to memory.

Stack trace:
(0003B5B5)
(007E344A)
(007E54B2)
(007E242C)
(00062496) ntdll.dll
(0000F13E) ntdll.dll.KiUserExceptionDispatcher
(000055A0)
(0007925D)
(000760EC)
(000769CC)
(0007671A)
(00019804)
(000769B2)
(0007671A)
(00075CC7)
(00382054)
(00169BB5)
(0033FF8C)
(000152F7) USER32.dll
(00015D35) USER32.dll
(000167BF) USER32.dll
(00016885) USER32.dll.DispatchMessageW

Status: unknown_rel_addr

The problem happens rarely. I cannot reproduce it.