メモリのアクセス違反

<Try to describe precise steps that lead to the problem (where do you click, what keys do you press, what do you see, etc.)>
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WinSCP 6.5.4

Error message:
メモリのアクセス違反

スタック トレース:
(00139BC4) System::UStrAsg
(000B345F) ntdll.dll
(0007A7CA) ntdll.dll.KiUserExceptionDispatcher

Status: all_insignificant

The problem happens rarely. I cannot reproduce it.