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 5.17.9

Error message:
メモリのアクセス違反

スタック トレース:
(0021C634) Vcl::Graphics::TBrush::SetColor
(00088F2F) ntdll.dll
(000743C1) ntdll.dll.KiUserExceptionDispatcher
(002761AD) Vcl::Controls::TControl::WndProc
(00275DE8) Vcl::Controls::TControl::Perform
(0027B19A) Vcl::Controls::TWinControl::PaintControls
(0027AF99) Vcl::Controls::TWinControl::PaintHandler
(0027B6A8) Vcl::Controls::TWinControl::WMPaint
(00280A81) Vcl::Controls::TCustomControl::WMPaint
(0027ACF1) Vcl::Controls::TWinControl::WndProc
(0027A338) Vcl::Controls::TWinControl::MainWndProc
(003A5954) System::Classes::_18201
(000437A9) USER32.dll
(000242A7) USER32.dll
(00023E45) USER32.dll
(0002D4CD) USER32.dll
(0007437B) ntdll.dll.KiUserCallbackDispatcher
(000231DB) USER32.dll.DispatchMessageW

The problem happens rarely. I cannot reproduce it.