<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 5.15.2

Error message:
Error reading RemoteDriveView.Indent: Access violation at address 00DA3CF8 in module 'WinSCP.exe'. Read of address 0000004C

Stack trace:
(001C2CF8) Vcl::Stdctrls::TCustomComboBox::KeyPress

(0039492B) System::Generics::Collections::TList__1<System::Generics::Collections::TPair__2<int, System::DelphiInterface<System::Classes::IInterfaceList> > >::
(00394B65) System::Generics::Collections::TList__1<System::Generics::Collections::TPair__2<int, System::DelphiInterface<System::Classes::IInterfaceList> > >::
(00394359) System::Generics::Collections::TArrayManager__1<System::Generics::Collections::TPair__2<int, System::DelphiInterface<System::Classes::IInterfaceList> > >::
(0039433B) System::Generics::Collections::TArrayManager__1<System::Generics::Collections::TPair__2<int, System::DelphiInterface<System::Classes::IInterfaceList> > >::
(003A1FB5) System::Win::Registry::TRegistry::
(003941B3) __tpdsc__ System::Generics::Defaults::IComparer__1<System::Generics::Collections::TPair__2<int, System::DelphiInterface<System::Classes::IInterfaceList> > >
(003943CD) System::Generics::Collections::TArrayManager__1<System::Generics::Collections::TPair__2<int, System::DelphiInterface<System::Classes::IInterfaceList> > >::
(0039433B) System::Generics::Collections::TArrayManager__1<System::Generics::Collections::TPair__2<int, System::DelphiInterface<System::Classes::IInterfaceList> > >::
(003A1FB5) System::Win::Registry::TRegistry::
(003941B3) __tpdsc__ System::Generics::Defaults::IComparer__1<System::Generics::Collections::TPair__2<int, System::DelphiInterface<System::Classes::IInterfaceList> > >
(003943CD) System::Generics::Collections::TArrayManager__1<System::Generics::Collections::TPair__2<int, System::DelphiInterface<System::Classes::IInterfaceList> > >::
(0039430C) __tpdsc__ System::Generics::Collections::TCollectionNotifyEvent__1<System::Generics::Collections::TPair__2<int, System::DelphiInterface<System::Classes::IInterfaceList> > >
(003A1FB5) System::Win::Registry::TRegistry::
(002323E9) Vcl::Extctrls::TTimer::UpdateTimer
(003952E7) System::Generics::Collections::TList__1<System::Generics::Collections::TPair__2<int, System::DelphiInterface<System::Classes::IInterfaceList> > >::
(0038F1B2) System::Generics::Collections::TList__1<System::Generics::Collections::TPair__2<int, System::DelphiInterface<System::Classes::IInterfaceList> > >::TList__1<System::Generics::Collections::TPair__2<int, System::DelphiInterface<System::Classes::IInterfaceList> > >
(00384BF7) System::Generics::Collections::TList__1<System::TObject *>::Move
(0038654B) System::Generics::Collections::TList__1<System::Classes::TBasicActionLink *>::DoDelete
(00386520) System::Generics::Collections::TList__1<System::Classes::TBasicActionLink *>::Grow
(003865D9) System::Generics::Collections::TList__1<System::Classes::TBasicActionLink *>::Notify
(00231BE2) Vcl::Extctrls::TImage::PictureChanged
(00004486) System::AnsiStringT<0>::AnsiStringT<0>
(00003B19) TCustomScpExplorerForm::TCustomScpExplorerForm
(0004B09E) TOwnConsole::Choice
(0023CB92) __tpdsc__ Vcl::Dialogs::TCustomTaskDialog
(008C9993) __tpdsc__ CFixedAlloc *
(00002664) __tpdsc__ System::Sysutils::Exception
(009250D1) Shdocvw_ocx::D855_1
(000631C6) ntdll.dll.RtlAreBitsSet
(00063193) ntdll.dll.RtlAreBitsSet

The problem happens rarely. I cannot reproduce it.