diff --git a/Classes/PHPExcel/CachedObjectStorage/Memory.php b/Classes/PHPExcel/CachedObjectStorage/Memory.php
index bbe3d9ba..dd01bc3b 100644
--- a/Classes/PHPExcel/CachedObjectStorage/Memory.php
+++ b/Classes/PHPExcel/CachedObjectStorage/Memory.php
@@ -96,7 +96,7 @@ class PHPExcel_CachedObjectStorage_Memory extends PHPExcel_CachedObjectStorage_C
 		$newCollection = array();
 		foreach($this->_cellCache as $k => &$cell) {
 			$newCollection[$k] = clone $cell;
-			$newCollection[$k]->attach($parent);
+			$newCollection[$k]->attach($this);
 		}
 
 		$this->_cellCache = $newCollection;
diff --git a/Examples/38cloneWorksheet.php b/Examples/38cloneWorksheet.php
new file mode 100644
index 00000000..d8e141c1
--- /dev/null
+++ b/Examples/38cloneWorksheet.php
@@ -0,0 +1,118 @@
+<?php
+/**
+ * PHPExcel
+ *
+ * Copyright (C) 2006 - 2013 PHPExcel
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * @category   PHPExcel
+ * @package    PHPExcel
+ * @copyright  Copyright (c) 2006 - 2013 PHPExcel (http://www.codeplex.com/PHPExcel)
+ * @license    http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt	LGPL
+ * @version    ##VERSION##, ##DATE##
+ */
+
+/** Error reporting */
+error_reporting(E_ALL);
+ini_set('display_errors', TRUE);
+ini_set('display_startup_errors', TRUE);
+date_default_timezone_set('Europe/London');
+
+define('EOL',(PHP_SAPI == 'cli') ? PHP_EOL : '<br />');
+
+/** Include PHPExcel */
+require_once '../Classes/PHPExcel.php';
+
+
+// Create new PHPExcel object
+echo date('H:i:s') , " Create new PHPExcel object" , EOL;
+$objPHPExcel = new PHPExcel();
+
+// Set document properties
+echo date('H:i:s') , " Set document properties" , EOL;
+$objPHPExcel->getProperties()->setCreator("Maarten Balliauw")
+							 ->setLastModifiedBy("Maarten Balliauw")
+							 ->setTitle("PHPExcel Test Document")
+							 ->setSubject("PHPExcel Test Document")
+							 ->setDescription("Test document for PHPExcel, generated using PHP classes.")
+							 ->setKeywords("office PHPExcel php")
+							 ->setCategory("Test result file");
+
+
+// Add some data
+echo date('H:i:s') , " Add some data" , EOL;
+$objPHPExcel->setActiveSheetIndex(0)
+            ->setCellValue('A1', 'Hello')
+            ->setCellValue('B2', 'world!')
+            ->setCellValue('C1', 'Hello')
+            ->setCellValue('D2', 'world!');
+
+// Miscellaneous glyphs, UTF-8
+$objPHPExcel->setActiveSheetIndex(0)
+            ->setCellValue('A4', 'Miscellaneous glyphs')
+            ->setCellValue('A5', 'éàèùâêîôûëïüÿäöüç');
+
+
+$objPHPExcel->getActiveSheet()->setCellValue('A8',"Hello\nWorld");
+$objPHPExcel->getActiveSheet()->getRowDimension(8)->setRowHeight(-1);
+$objPHPExcel->getActiveSheet()->getStyle('A8')->getAlignment()->setWrapText(true);
+
+
+// Rename worksheet
+echo date('H:i:s') , " Rename worksheet" , EOL;
+$objPHPExcel->getActiveSheet()->setTitle('Simple');
+
+
+// Clone worksheet
+echo date('H:i:s') , " Clone worksheet" , EOL;
+$clonedSheet = clone $objPHPExcel->getActiveSheet();
+$clonedSheet
+    ->setCellValue('A1', 'Goodbye')
+    ->setCellValue('A2', 'cruel')
+    ->setCellValue('C1', 'Goodbye')
+    ->setCellValue('C2', 'cruel');
+
+// Rename cloned worksheet
+echo date('H:i:s') , " Rename cloned worksheet" , EOL;
+$clonedSheet->setTitle('Simple Clone');
+$objPHPExcel->addSheet($clonedSheet);
+
+
+// Set active sheet index to the first sheet, so Excel opens this as the first sheet
+$objPHPExcel->setActiveSheetIndex(0);
+
+
+// Save Excel 2007 file
+echo date('H:i:s') , " Write to Excel2007 format" , EOL;
+$callStartTime = microtime(true);
+
+$objWriter = PHPExcel_IOFactory::createWriter($objPHPExcel, 'Excel2007');
+$objWriter->save(str_replace('.php', '.xlsx', __FILE__));
+$callEndTime = microtime(true);
+$callTime = $callEndTime - $callStartTime;
+
+echo date('H:i:s') , " File written to " , str_replace('.php', '.xlsx', pathinfo(__FILE__, PATHINFO_BASENAME)) , EOL;
+echo 'Call time to write Workbook was ' , sprintf('%.4f',$callTime) , " seconds" , EOL;
+// Echo memory usage
+echo date('H:i:s') , ' Current memory usage: ' , (memory_get_usage(true) / 1024 / 1024) , " MB" , EOL;
+
+
+// Echo memory peak usage
+echo date('H:i:s') , " Peak memory usage: " , (memory_get_peak_usage(true) / 1024 / 1024) , " MB" , EOL;
+
+// Echo done
+echo date('H:i:s') , " Done writing files" , EOL;
+echo 'File has been created in ' , getcwd() , EOL;
diff --git a/Examples/runall.php b/Examples/runall.php
index 00f43eae..e19835f8 100644
--- a/Examples/runall.php
+++ b/Examples/runall.php
@@ -90,6 +90,7 @@ $aTests = array(
 	, '35chartrender.php'
 	, '36chartreadwriteHTML.php'
 	, '37page_layout_view.php'
+	, '38cloneWorksheet.php'
 	, '40duplicateStyle.php'
 	, 'OOCalcReader.php'
 	, 'SylkReader.php'