Invalid access to memory

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WinSCP 5.7.7

Error message:
Invalid access to memory.

Stack trace:
(0037EEE0)
(00062496) ntdll.dll
(0000F13E) ntdll.dll.KiUserExceptionDispatcher
(00672F6F)
(006724BA)

Status: unknown_rel_addr

The problem happens rarely. I cannot reproduce it.