<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 5.9.2

Error message:
Invalid access to memory.

Stack trace:
(00406A0F) Customdirview::TCustomDirView::Reload
(0008137F) ntdll.dll
(0006EF1A) ntdll.dll.KiUserExceptionDispatcher
(00412195) Dirview::TDirView::Reload
(00016B32) TCustomScpExplorerForm::Idle
(0003CE17) TNonVisualDataModule::DoIdle
(0003CDD4) TNonVisualDataModule::SessionIdleTimerTimer
(00372BEC) System::Classes::_18201
(0002C271) USER32.dll
(0000D845) USER32.dll
(0000D19F) USER32.dll
(0000CF5B) USER32.dll.DispatchMessageW

The problem happens rarely. I cannot reproduce it.