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Prevent the function from taking values

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I have a problem using this two functions "FileSelectFolder" and "_FileListToArray".

Whenever I click cancel button on the "FileSelectFolder". It will store value to my variable.

Is there anyway to stop the variable from taking values?

AutoIt         
; Loop until user exits     While 1     $msg = GUIGetMsg()     Select         Case $msg = $GUI_EVENT_CLOSE             Exit          Case $msg = $btn_browse         $ordner = FileSelectFolder("Choose folder","")         $dateien = _FileListToArray($ordner, "*", 1)        _GUICtrlListBox_BeginUpdate($hListBox)          For $i = 1 To UBound($dateien) - 1             ; Add file     _GUICtrlListBox_AddString($hListBox, $dateien[$i])  Next   _GUICtrlListBox_EndUpdate($hListBox)     Case $msg = $btn_transfer                     ScanFolder($ordner)                  EndSelect                 WEnd

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