<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 5.17.5

Error message:
Ошибка доступа к памяти.

Трассировка стека:
(002AB6A3) Vcl::Comctrls::TTreeNode::EndEdit
(0007DA8F) ntdll.dll
(0006B6B1) ntdll.dll.KiUserExceptionDispatcher
(0044BBDD) Dirview::TDirView::
(0044BBDD) Dirview::TDirView::
(0044BC6C) Dirview::TDirView::
(0045E3A2) Driveview::TDriveView::WatchThreadActive
(0044B8FD) Dirview::TDirView::
(002508CF) Vcl::Extctrls::TSplitter::FindControl
(003A4AA8) System::Classes::TLoginCredentialService::TLoginFuncProxy::TLoginFuncProxy
(0003AE69) USER32.dll
(00037335) USER32.dll
(00036BE9) USER32.dll
(000369CB) USER32.dll.DispatchMessageW

The problem happens rarely. I cannot reproduce it.