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.)>
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WinSCP 5.17.6

Error message:
メモリのアクセス違反

スタック トレース:
(0021B7A8) Vcl::Graphics::TBrush::SetColor
(00087E3F) ntdll.dll
(000732C1) ntdll.dll.KiUserExceptionDispatcher
(00275321) Vcl::Controls::TControl::WndProc
(00274F5C) Vcl::Controls::TControl::Perform
(0027A30E) Vcl::Controls::TWinControl::PaintControls
(0027A10D) Vcl::Controls::TWinControl::PaintHandler
(0027A81C) Vcl::Controls::TWinControl::WMPaint
(0027FBF5) Vcl::Controls::TCustomControl::WMPaint
(00279E65) Vcl::Controls::TWinControl::WndProc
(002794AC) Vcl::Controls::TWinControl::MainWndProc
(003A4AC8) System::Classes::_18201
(00043449) USER32.dll
(00023F87) USER32.dll
(00023B25) USER32.dll
(0002D16D) USER32.dll
(0007327B) ntdll.dll.KiUserCallbackDispatcher
(00022EBB) USER32.dll.DispatchMessageW

The problem happens rarely. I cannot reproduce it.