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 5.9.5

Error message:
メモリのアクセス違反

スタック トレース:
(003E687C) System::UStrCmp
(0003EE3E) ntdll.dll.ZwWow64CallFunction64
(0003F5BA) ntdll.dll.KiUserExceptionDispatcher
(0078BDA3) std::_Tree<std::_Tmap_traits<System::UnicodeString, int, std::less<System::UnicodeString>, std::allocator<std::pair<const System::UnicodeString, int> >, 0> >::_Lbound
(0078BC30) TUsage::Inc
(0078BBD5) TUsage::Inc
(00024FD5) TCustomScpExplorerForm::DirViewSelectItem
(00292CF5) Vcl::Comctrls::TCustomListView::DoSelectItem
(00292B3A) Vcl::Comctrls::TCustomListView::CNNotify

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.