<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 5.7.7

Error message:
Ошибка доступа к памяти.

Трассировка стека:
(0067250C) TTerminalItem::ProcessUserAction
(00095ADF) ntdll.dll
(0008349A) ntdll.dll.KiUserExceptionDispatcher
(00673F25) TQueueItemProxy::ProcessUserAction
(00014E3A) TCustomScpExplorerForm::UserActionTimer
(001F3137) Vcl::Extctrls::TTimer::Timer
(0034059C) System::Classes::_18201
(00032E81) USER32.dll
(00017116) USER32.dll
(00016C5B) USER32.dll
(00016AAB) USER32.dll.DispatchMessageW

The problem happens rarely. I cannot reproduce it.