メモリのアクセス違反 - Vcl::Graphics::TBrush::SetColor

<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 5.17.5

Error message:
メモリのアクセス違反

スタック トレース:
(0021B788) Vcl::Graphics::TBrush::SetColor
(00087E3F) ntdll.dll
(000732D1) ntdll.dll.KiUserExceptionDispatcher
(00275301) Vcl::Controls::TControl::WndProc
(00274F3C) Vcl::Controls::TControl::Perform
(0027A2EE) Vcl::Controls::TWinControl::PaintControls
(0027A0ED) Vcl::Controls::TWinControl::PaintHandler
(0027A7FC) Vcl::Controls::TWinControl::WMPaint
(0027FBD5) Vcl::Controls::TCustomControl::WMPaint
(00279E45) Vcl::Controls::TWinControl::WndProc
(0027948C) Vcl::Controls::TWinControl::MainWndProc
(003A4AA8) System::Classes::_18201
(000434B9) USER32.dll
(00023FF7) USER32.dll
(00023B95) USER32.dll
(0002D1DD) USER32.dll
(0007328B) ntdll.dll.KiUserCallbackDispatcher
(00022F2B) USER32.dll.DispatchMessageW

The problem happens rarely. I cannot reproduce it.