<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 5.13.1

Error message:
メモリのアクセス違反

スタック トレース:
(001FB3BB) Vcl::Graphics::TBrush::GetHandle
(0008A63F) ntdll.dll
(00077E9A) ntdll.dll.KiUserExceptionDispatcher
(001FC6EB) Vcl::Graphics::TCanvas::CreateBrush
(004889E1) Tbxofficexptheme::TTBXOfficeXPTheme::PaintImage
(00479921) Tbx::DrawTBXImage
(0048C76C) Tbxstatusbars::TTBXCustomStatusBar::PaintPanel

The problem happens rarely. I cannot reproduce it.