List index out of bounds (0) - UnixExtractCommonPath

<Try to describe precise steps that lead to the problem (where do you click, what keys do you press, what do you see, etc.)>
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WinSCP 6.1.2

Error message:
List index out of bounds (0)

Rastreamento de pilha:
(001FC4D5) System::Classes::TStringList::GetObject
(001FC4D5) System::Classes::TStringList::GetObject
(00D237EB) UnixExtractCommonPath
(00D1B435) Queue::C3610_0
(00D2017C) TDeleteQueueItem::TDeleteQueueItem
(00018879) TCustomScpExplorerForm::DeleteFiles
(00011F90) TCustomScpExplorerForm::ExecuteDeleteFileOperation
(00012046) TCustomScpExplorerForm::ExecuteFileOperation
(0001224C) TCustomScpExplorerForm::ExecuteFileOperation
(0001240B) TCustomScpExplorerForm::ExecuteFileOperationCommand
(0004D89C) TNonVisualDataModule::ExplorerActionsExecute
(0026344C) System::Actions::TContainedActionList::ExecuteAction

(01004455) C6083_0
(01005A2F) _ReThrowException
(00018ACD) TCustomScpExplorerForm::DeleteFiles
(00011F90) TCustomScpExplorerForm::ExecuteDeleteFileOperation
(00012046) TCustomScpExplorerForm::ExecuteFileOperation
(0001224C) TCustomScpExplorerForm::ExecuteFileOperation
(0001240B) TCustomScpExplorerForm::ExecuteFileOperationCommand
(0004D89C) TNonVisualDataModule::ExplorerActionsExecute
(0026344C) System::Actions::TContainedActionList::ExecuteAction

The problem happens rarely. I cannot reproduce it.