<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 5.13.4

Error message:
无效的内存访问。

Stack trace:
(00040E60) TNonVisualDataModule::ShowUpdatesUpdate
(0007DABF) ntdll.dll
(0006B6E1) ntdll.dll.KiUserExceptionDispatcher
(003C2F1C) System::Actions::TContainedActionList::UpdateAction
(001A8CB2) Vcl::Actnlist::TCustomAction::Update
(0021AB1A) Vcl::Forms::_16777
(0021AB98) Vcl::Forms::TCustomForm::UpdateActions
(00006F65) TCustomScpExplorerForm::UpdateActions
(00023CCA) TCustomScpExplorerForm::Dispatch
(0025B9D5) Vcl::Controls::TWinControl::WndProc
(00215E9C) Vcl::Forms::TCustomForm::WndProc
(0085C048) Vclcommon::C2788_0

(00363CA5) System::Classes::TList::Get
(0007DABF) ntdll.dll
(0006B6E1) ntdll.dll.KiUserExceptionDispatcher
(0021A271) Vcl::Forms::TCustomForm::CloseQuery
(0025B9D5) Vcl::Controls::TWinControl::WndProc
(00215E9C) Vcl::Forms::TCustomForm::WndProc

The problem happens rarely. I cannot reproduce it.