Thanks for your report.
I have sent you an email with a debug version of WinSCP to the address you have used to register on this forum.

<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 5.13.2

Error message:
メモリのアクセス違反

スタック トレース:
(001FC887) Vcl::Graphics::TBrush::GetHandle
(0006248E) ntdll.dll
(0000F15E) ntdll.dll.KiUserExceptionDispatcher
(0025BCE3) Vcl::Controls::TWinControl::WMEraseBkgnd
(0025AEE1) Vcl::Controls::TWinControl::WndProc
(0025A528) Vcl::Controls::TWinControl::MainWndProc
(0038022C) System::Classes::_18201
(000152F7) USER32.dll
(00016311) USER32.dll.GetDC
(00015DE3) USER32.dll
(00015E41) USER32.dll
(0000F137) ntdll.dll.KiUserCallbackDispatcher
(0001F764) USER32.dll

I know how to reproduce the problem or the problem happens frequently enough. I wish to be contacted by the WinSCP team to help resolving the problem.