<Try to describe precise steps that lead to the problem (where do you click, what keys do you press, what do you see, etc.)>
Changing a folder on the right panel
<If relevant, consider attaching a session log file or a screenshot)>

WinSCP 5.15.9

Error message:
Privileged instruction

Stack trace:
(001CF00A) __tpdsc__ Vcl::Stdctrls::TLabel
(0092812A) C5157_3
(0092A192) ____ExceptionHandler
(00926F4C) __ExceptionHandler
(0008422F) ntdll.dll
(00071B31) ntdll.dll.KiUserExceptionDispatcher
(0081AC52) TTerminal::CommandError
(0081A9E5) TTerminal::CommandError
(00824642) TTerminal::ChangeDirectory
(00819392) TTerminal::SetCurrentDirectoryW
(006D08E6) TUnixDirView::SetPath
(000514C2) TScpCommanderForm::RemotePathLabelPathClick
(0043B5F9) Pathlabel::TCustomPathLabel::DoPathClick
(00439DB4) Pathlabel::TCustomPathLabel::Click
(002750D5) Vcl::Controls::TControl::WMLButtonUp
(00274310) Vcl::Controls::TControl::Perform
(00278AE7) Vcl::Controls::TWinControl::IsControlMouseMsg
(00278860) Vcl::Controls::TWinControl::MainWndProc
(003A3E7C) System::Classes::_18201
(00044CA9) USER32.dll
(000357B7) USER32.dll
(000348F6) USER32.dll
(000346CB) USER32.dll.DispatchMessageW

(00928795) C5157_3
(00929D6F) _ReThrowException
(00817651) TTerminal::HandleExtendedException
(0081AC52) TTerminal::CommandError
(0081A9E5) TTerminal::CommandError
(00824642) TTerminal::ChangeDirectory
(00819392) TTerminal::SetCurrentDirectoryW
(006D08E6) TUnixDirView::SetPath
(000514C2) TScpCommanderForm::RemotePathLabelPathClick
(0043B5F9) Pathlabel::TCustomPathLabel::DoPathClick
(00439DB4) Pathlabel::TCustomPathLabel::Click
(002750D5) Vcl::Controls::TControl::WMLButtonUp
(00274310) Vcl::Controls::TControl::Perform
(00278AE7) Vcl::Controls::TWinControl::IsControlMouseMsg
(00278860) Vcl::Controls::TWinControl::MainWndProc
(003A3E7C) System::Classes::_18201
(00044CA9) USER32.dll
(000357B7) USER32.dll
(000348F6) USER32.dll
(000346CB) USER32.dll.DispatchMessageW

The problem happens rarely. I cannot reproduce it.