<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 5.13.5

Error message:
Zugriffsverletzung - ungültiger Zugriff auf den Speicher.

Stack trace:
(007BACCA)
(008BED3E)
(008C0DA6)
(008BDB60)
(0007DABF) ntdll.dll
(0006B6E1) ntdll.dll.KiUserExceptionDispatcher
(00005EFF)
(00005DBE)
(00005E0E)
(0009612C)
(00096572)
(000A4F45)
(0001D7B0)
(00097A71)
(007BA470)
(0021FADE)
(00380EE0)
(0003AF19) USER32.dll
(000373E5) USER32.dll
(00036C99) USER32.dll
(00036A7B) USER32.dll.DispatchMessageW

Status: unknown_rel_addr

The problem happens rarely. I cannot reproduce it.