Invalid access to memory

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WinSCP 5.7.7

Error message:
Invalid access to memory.

Stack trace:
(007E0326)
(0003EE3E) ntdll.dll.ZwWow64CallFunction64
(0003F5BA) ntdll.dll.KiUserExceptionDispatcher
(00056E2E)

Status: unknown_rel_addr

The problem happens rarely. I cannot reproduce it.