Out of system resources - Vcl::Graphics::TBitmap::CopyImage

<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 6.5.4

Error message:
Out of system resources

Stack trace:
(0037EDA3) Vcl::Graphics::_16695
(0037EE4A) Vcl::Graphics::_16696
(0037EE7F) Vcl::Graphics::_16697
(00384E5B) Vcl::Graphics::TBitmap::CopyImage
(00387053) Vcl::Graphics::TBitmap::SetSize
(0048A5B6) Vcl::Imglist::TCustomImageList::AddImage
(003C82F3) Vcl::Stdctrls::TCustomButton::UpdateImages
(003A27AE) Vcl::Controls::TWinControl::UpdateShowing
(003A27AE) Vcl::Controls::TWinControl::UpdateShowing
(003A27AE) Vcl::Controls::TWinControl::UpdateShowing
(003A292E) Vcl::Controls::TWinControl::UpdateControlState
(003A56F2) Vcl::Controls::TWinControl::CMVisibleChanged
(00DB1892) TLoginDialog::Dispatch
(003A356D) Vcl::Controls::TWinControl::WndProc
(004A77B4) Vcl::Forms::TCustomForm::WndProc
(00E06D03) Vclcommon::C4884_0
(0039DFF8) Vcl::Controls::TControl::Perform
(0039CA26) Vcl::Controls::TControl::SetVisible
(00DB0AD0) TLoginDialog::Execute
(00121243) GetLoginData
(000CE441) TTerminalManager::NewSession
(0001D0FE) TCustomScpExplorerForm::NewSession
(0001D147) TCustomScpExplorerForm::NewTab
(0005B9AE) TScpCommanderForm::NewTab
(00025A27) TCustomScpExplorerForm::SessionTabSwitched
(00025AA4) TCustomScpExplorerForm::SessionsPageControlChange
(00402209) Vcl::Comctrls::TCustomTabControl::Change
(003A356D) Vcl::Controls::TWinControl::WndProc
(0039DFF8) Vcl::Controls::TControl::Perform
(003A36C7) Vcl::Controls::_17122
(0039E3C2) Vcl::Controls::TControl::WndProc
(003A356D) Vcl::Controls::TWinControl::WndProc
(004A77B4) Vcl::Forms::TCustomForm::WndProc
(00E06D03) Vclcommon::C4884_0
(003A2A78) Vcl::Controls::TWinControl::MainWndProc
(00204C90) System::Classes::_18364
(00046891) USER32.dll
(00027075) USER32.dll
(00026B05) USER32.dll
(0002E96D) USER32.dll
(00074D8B) ntdll.dll.KiUserCallbackDispatcher
(00025DDE) USER32.dll.SendMessageW
(0008CAE9) COMCTL32.DLL
(000768D6) COMCTL32.DLL
(0003D5F0) COMCTL32.DLL
(0003A624) COMCTL32.DLL
(0003BDA0) COMCTL32.DLL
(00046891) USER32.dll
(00027075) USER32.dll
(00025ECA) USER32.dll.CallWindowProcW
(003A3675) Vcl::Controls::TWinControl::DefaultHandler
(00BB298A) TThemePageControl::Dispatch
(003A356D) Vcl::Controls::TWinControl::WndProc
(003A2A78) Vcl::Controls::TWinControl::MainWndProc
(00204C90) System::Classes::_18364
(00046891) USER32.dll
(00027075) USER32.dll
(00025ECA) USER32.dll.CallWindowProcW
(0053954B) Dragdrop::TDragDrop::WndMethod
(00204C90) System::Classes::_18364
(00046891) USER32.dll
(00027075) USER32.dll
(00025B80) USER32.dll
(000256AB) USER32.dll.DispatchMessageW

The problem happens rarely. I cannot reproduce it.

<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 6.5.1

Error message:
Out of system resources

スタック トレース:
(0037EC67) Vcl::Graphics::_16695
(0037ED0E) Vcl::Graphics::_16696
(0037ED43) Vcl::Graphics::_16697
(00384D1F) Vcl::Graphics::TBitmap::CopyImage
(00386F17) Vcl::Graphics::TBitmap::SetSize
(0044C58C) Vcl::Extctrls::TPaintBox::Paint
(0039E286) Vcl::Controls::TControl::WndProc
(0039DEBC) Vcl::Controls::TControl::Perform
(003A38D2) Vcl::Controls::TWinControl::PaintControls
(0039D0C5) Vcl::Controls::TControl::Repaint
(0009E470) TFrameAnimation::Repaint
(00204B54) System::Classes::_18364
(00038991) USER32.dll
(00026AE8) USER32.dll
(00025F75) USER32.dll
(00025ADB) USER32.dll.DispatchMessageW

The problem happens rarely. I cannot reproduce it.