diff --git a/Classes/PHPExcel.php b/Classes/PHPExcel.php
index fe81333..27a1853 100644
--- a/Classes/PHPExcel.php
+++ b/Classes/PHPExcel.php
@@ -628,7 +628,7 @@ class PHPExcel
 			// then update cellXf indexes for cells
 			foreach ($this->_workSheetCollection as $worksheet) {
 				foreach ($worksheet->getCellCollection(false) as $cellID) {
-					$cell = $sheet->getCell($cellID);
+					$cell = $worksheet->getCell($cellID);
 					$xfIndex = $cell->getXfIndex();
 					if ($xfIndex > $pIndex ) {
 						// decrease xf index by 1
diff --git a/changelog.txt b/changelog.txt
index ce8b91e..ff1ac51 100644
--- a/changelog.txt
+++ b/changelog.txt
@@ -37,6 +37,7 @@ Fixed in SVN:
 - Bugfix:   (MBaker) Workitem 12998 - PHPExcel_Reader_Excel2007 fails when gradient fill without type is present in a file
 - Bugfix:   (MBaker) Workitem 14176 - @ format for numeric strings in XLSX to CSV conversion
 - Bugfix:   (MBaker) Workitem 14223 - Advanced Value Binder Not Working?
+- Bugfix:   (MBaker) Workitem 14226 - unassigned object variable in PHPExcel->removeCellXfByIndex
 
 
 2010-08-26 (v1.7.4):