无效的内存访问。 - std::_Tree<std::_Tmap_traits<System::UnicodeString, System::UnicodeString, std::less<System::UnicodeString>, std::allocator<std::pair<const System::UnicodeString, System::UnicodeString> >, 0> >::_In

<Try to describe precise steps that lead to the problem (where do you click, what keys do you press, what do you see, etc.)>

Run WinSCP, don't login, close login window, then close WinSCP main window, Error!

<If relevant, consider attaching a session log file or a screenshot)>

WinSCP 5.18.1

Error message:
无效的内存访问。

Stack trace:
(00CE29D_) std::_Tree<std::_Tmap_traits<System::UnicodeString, System::UnicodeString, std::less<System::UnicodeString>, std::allocator<std::pair<const System::UnicodeString, System::UnicodeString> >, 0> >::_Insert
(000861AF) ntdll.dll
(00072B31) ntdll.dll.KiUserExceptionDispatcher
(00019854) TCustomScpExplorerForm::FormCloseQuery
(000198FE) TCustomScpExplorerForm::FormCloseQuery
(0023E5F5) Vcl::Forms::TApplication::PopupControlProc
(0027FD59) Vcl::Controls::TWinControl::SetParent
(0023A220) Vcl::Forms::TCustomForm::IsShortCut

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.

Thanks for your report.

This bug is being tracked already:
https://winscp.net/tracker/1947