<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 5.7.1

Error message:
メモリのアクセス違反

スタック トレース:
[01AED820]
[77D37166] ntdll.dll.RtlRaiseStatus
[77D36FF2] ntdll.dll.KiUserExceptionDispatcher
[01762888]
[0154A39E]
[015BC206]
[015BC284]

Status: symbol_unknown

The problem happens rarely. I cannot reproduce it.