<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 5.7.5

Error message:
Invalid access to memory.

Stack trace:
(0021F113) Vcl::Controls::TWinControl::HandleNeeded
(0003F07E) ntdll.dll.ZwWow64CallFunction64
(0003F7FA) ntdll.dll.KiUserExceptionDispatcher
(003DE8B4) Customdriveview::TCustomDriveView::IterateSubTree
(003EFFCF) Driveview::TDriveView::ValidateDirectoryEx
(003DE585) Customdriveview::TCustomDriveView::ValidateDirectory
(001F2E27) Vcl::Extctrls::TTimer::Timer
(0034021C) System::Classes::_18201
(00007E6F) USER32.DLL.CallNextHookEx
(000080CC) USER32.DLL
(0000966A) USER32.DLL
(000096DB) USER32.DLL.DispatchMessageW

The problem happens rarely. I cannot reproduce it.