Invalid access to memory - Dirview::TDirView::PerformDragDropFileOperation

<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 5.17.3

Error message:
Invalid access to memory.

Stack trace:
(004166A_) Dirview::TDirView::PerformDragDropFileOperation
(00F876DE)
(00F89746)
(00F86500)
(00087E3F) ntdll.dll
(000732C1) ntdll.dll.KiUserExceptionDispatcher
(004FB8E_) CFtpControlSocket::LogOnToServer

The problem happens rarely. I cannot reproduce it.