Invalid access to memory

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WinSCP 5.17.10

Error message:
Invalid access to memory.

Stack trace:
(00419098) System::HandleAnyException
(0008776F) ntdll.dll
(00073E91) ntdll.dll.KiUserExceptionDispatcher
(003A5978) System::Classes::_18201
(0003DEB9) USER32.dll
(00034E75) USER32.dll
(00032BE5) USER32.dll
(000329AB) USER32.dll.DispatchMessageW

Status: all_insignificant

The problem happens rarely. I cannot reproduce it.