<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 6.3.2

Error message:
List index out of bounds (0)

Stack trace:
(0020DE11) System::Classes::TStringList::GetObject
(0020DE11) System::Classes::TStringList::GetObject
(00C56F02) TParallelOperation::GetFileList
(00C595D0) TParallelOperation::UpdateFileList
(00B7AF8B) TTransferQueueItem::UpdateFileList
(00B77EBE) TTerminalQueue::ItemGetData
(00B7A2E2) TQueueItemProxy::UpdateFileList
(00009170) TCustomScpExplorerForm::QueueChanged
(00008BDA) TCustomScpExplorerForm::SetQueue
(000C27C0) TTerminalManager::UpdateScpExplorer
(000C50F4) TTerminalManager::SessionReady
(000C2704) TTerminalManager::FreeTerminal
(000C19D3) TTerminalManager::FreeActiveTerminal
(00AE6C7A) TThemePageControl::Dispatch
(00409261) Vcl::Controls::TWinControl::WndProc
(004088A8) Vcl::Controls::TWinControl::MainWndProc
(00226F88) System::Classes::_18201
(00040999) USER32.dll
(00036DB5) USER32.dll
(00036571) USER32.dll.GetSystemMetricsForDpi
(00034D96) USER32.dll.CallWindowProcW
(004C30AB) Dragdrop::TDragDrop::WndMethod
(00226F88) System::Classes::_18201
(00040999) USER32.dll
(00036DB5) USER32.dll
(000356EC) USER32.dll
(0003520B) USER32.dll.DispatchMessageW

The problem happens rarely. I cannot reproduce it.