diff --git a/Classes/PHPExcel/CachedObjectStorage/APC.php b/Classes/PHPExcel/CachedObjectStorage/APC.php
index 55454fa..3a6b53d 100644
--- a/Classes/PHPExcel/CachedObjectStorage/APC.php
+++ b/Classes/PHPExcel/CachedObjectStorage/APC.php
@@ -61,7 +61,7 @@ class PHPExcel_CachedObjectStorage_APC extends PHPExcel_CachedObjectStorage_Cach
      * @throws  PHPExcel_Exception
      */
     protected function _storeData() {
-        if ($this->_currentCellIsDirty) {
+        if ($this->_currentCellIsDirty && !empty($this->_currentObjectID)) {
             $this->_currentObject->detach();
 
             if (!apc_store($this->_cachePrefix.$this->_currentObjectID.'.cache',serialize($this->_currentObject),$this->_cacheTime)) {
diff --git a/Classes/PHPExcel/CachedObjectStorage/DiscISAM.php b/Classes/PHPExcel/CachedObjectStorage/DiscISAM.php
index 1a319d0..5afc26b 100644
--- a/Classes/PHPExcel/CachedObjectStorage/DiscISAM.php
+++ b/Classes/PHPExcel/CachedObjectStorage/DiscISAM.php
@@ -65,7 +65,7 @@ class PHPExcel_CachedObjectStorage_DiscISAM extends PHPExcel_CachedObjectStorage
      * @throws	PHPExcel_Exception
      */
 	protected function _storeData() {
-		if ($this->_currentCellIsDirty) {
+		if ($this->_currentCellIsDirty && !empty($this->_currentObjectID)) {
 			$this->_currentObject->detach();
 
 			fseek($this->_fileHandle,0,SEEK_END);
diff --git a/Classes/PHPExcel/CachedObjectStorage/Igbinary.php b/Classes/PHPExcel/CachedObjectStorage/Igbinary.php
index 6af87b3..aaee021 100644
--- a/Classes/PHPExcel/CachedObjectStorage/Igbinary.php
+++ b/Classes/PHPExcel/CachedObjectStorage/Igbinary.php
@@ -43,7 +43,7 @@ class PHPExcel_CachedObjectStorage_Igbinary extends PHPExcel_CachedObjectStorage
      * @throws	PHPExcel_Exception
      */
 	protected function _storeData() {
-		if ($this->_currentCellIsDirty) {
+		if ($this->_currentCellIsDirty && !empty($this->_currentObjectID)) {
 			$this->_currentObject->detach();
 
 			$this->_cellCache[$this->_currentObjectID] = igbinary_serialize($this->_currentObject);
diff --git a/Classes/PHPExcel/CachedObjectStorage/Memcache.php b/Classes/PHPExcel/CachedObjectStorage/Memcache.php
index 2c33050..27ffc19 100644
--- a/Classes/PHPExcel/CachedObjectStorage/Memcache.php
+++ b/Classes/PHPExcel/CachedObjectStorage/Memcache.php
@@ -65,7 +65,7 @@ class PHPExcel_CachedObjectStorage_Memcache extends PHPExcel_CachedObjectStorage
      * @throws	PHPExcel_Exception
      */
 	protected function _storeData() {
-		if ($this->_currentCellIsDirty) {
+		if ($this->_currentCellIsDirty && !empty($this->_currentObjectID)) {
 			$this->_currentObject->detach();
 
 			$obj = serialize($this->_currentObject);
diff --git a/Classes/PHPExcel/CachedObjectStorage/MemoryGZip.php b/Classes/PHPExcel/CachedObjectStorage/MemoryGZip.php
index f8a7791..7327dc1 100644
--- a/Classes/PHPExcel/CachedObjectStorage/MemoryGZip.php
+++ b/Classes/PHPExcel/CachedObjectStorage/MemoryGZip.php
@@ -43,7 +43,7 @@ class PHPExcel_CachedObjectStorage_MemoryGZip extends PHPExcel_CachedObjectStora
      * @throws	PHPExcel_Exception
      */
 	protected function _storeData() {
-		if ($this->_currentCellIsDirty) {
+		if ($this->_currentCellIsDirty && !empty($this->_currentObjectID)) {
 			$this->_currentObject->detach();
 
 			$this->_cellCache[$this->_currentObjectID] = gzdeflate(serialize($this->_currentObject));
diff --git a/Classes/PHPExcel/CachedObjectStorage/MemorySerialized.php b/Classes/PHPExcel/CachedObjectStorage/MemorySerialized.php
index 9825cab..12c9b58 100644
--- a/Classes/PHPExcel/CachedObjectStorage/MemorySerialized.php
+++ b/Classes/PHPExcel/CachedObjectStorage/MemorySerialized.php
@@ -43,7 +43,7 @@ class PHPExcel_CachedObjectStorage_MemorySerialized extends PHPExcel_CachedObjec
      * @throws	PHPExcel_Exception
      */
 	protected function _storeData() {
-		if ($this->_currentCellIsDirty) {
+		if ($this->_currentCellIsDirty && !empty($this->_currentObjectID)) {
 			$this->_currentObject->detach();
 
 			$this->_cellCache[$this->_currentObjectID] = serialize($this->_currentObject);
diff --git a/Classes/PHPExcel/CachedObjectStorage/PHPTemp.php b/Classes/PHPExcel/CachedObjectStorage/PHPTemp.php
index 61fb416..9078b37 100644
--- a/Classes/PHPExcel/CachedObjectStorage/PHPTemp.php
+++ b/Classes/PHPExcel/CachedObjectStorage/PHPTemp.php
@@ -57,7 +57,7 @@ class PHPExcel_CachedObjectStorage_PHPTemp extends PHPExcel_CachedObjectStorage_
      * @throws	PHPExcel_Exception
      */
 	protected function _storeData() {
-		if ($this->_currentCellIsDirty) {
+		if ($this->_currentCellIsDirty && !empty($this->_currentObjectID)) {
 			$this->_currentObject->detach();
 
 			fseek($this->_fileHandle,0,SEEK_END);
diff --git a/Classes/PHPExcel/CachedObjectStorage/SQLite.php b/Classes/PHPExcel/CachedObjectStorage/SQLite.php
index 1b0221e..3585f75 100644
--- a/Classes/PHPExcel/CachedObjectStorage/SQLite.php
+++ b/Classes/PHPExcel/CachedObjectStorage/SQLite.php
@@ -57,7 +57,7 @@ class PHPExcel_CachedObjectStorage_SQLite extends PHPExcel_CachedObjectStorage_C
      * @throws	PHPExcel_Exception
      */
 	protected function _storeData() {
-		if ($this->_currentCellIsDirty) {
+		if ($this->_currentCellIsDirty && !empty($this->_currentObjectID)) {
 			$this->_currentObject->detach();
 
 			if (!$this->_DBHandle->queryExec("INSERT OR REPLACE INTO kvp_".$this->_TableName." VALUES('".$this->_currentObjectID."','".sqlite_escape_string(serialize($this->_currentObject))."')"))
diff --git a/Classes/PHPExcel/CachedObjectStorage/SQLite3.php b/Classes/PHPExcel/CachedObjectStorage/SQLite3.php
index 7e69247..187b83f 100644
--- a/Classes/PHPExcel/CachedObjectStorage/SQLite3.php
+++ b/Classes/PHPExcel/CachedObjectStorage/SQLite3.php
@@ -85,7 +85,7 @@ class PHPExcel_CachedObjectStorage_SQLite3 extends PHPExcel_CachedObjectStorage_
      * @throws	PHPExcel_Exception
      */
 	protected function _storeData() {
-		if ($this->_currentCellIsDirty) {
+		if ($this->_currentCellIsDirty && !empty($this->_currentObjectID)) {
 			$this->_currentObject->detach();
 
 			$this->_insertQuery->bindValue('id',$this->_currentObjectID,SQLITE3_TEXT);
diff --git a/Classes/PHPExcel/CachedObjectStorage/Wincache.php b/Classes/PHPExcel/CachedObjectStorage/Wincache.php
index af31eb7..c4fbd37 100644
--- a/Classes/PHPExcel/CachedObjectStorage/Wincache.php
+++ b/Classes/PHPExcel/CachedObjectStorage/Wincache.php
@@ -58,7 +58,7 @@ class PHPExcel_CachedObjectStorage_Wincache extends PHPExcel_CachedObjectStorage
      * @throws	PHPExcel_Exception
      */
 	protected function _storeData() {
-		if ($this->_currentCellIsDirty) {
+		if ($this->_currentCellIsDirty && !empty($this->_currentObjectID)) {
 			$this->_currentObject->detach();
 
 			$obj = serialize($this->_currentObject);
diff --git a/changelog.txt b/changelog.txt
index db0bc14..9c88414 100644
--- a/changelog.txt
+++ b/changelog.txt
@@ -41,6 +41,7 @@ Fixed in develop branch for release v1.8.0:
 - Bugfix:   (PowerKiKi)       Work Item GH-270/GH-31  - Binary comparison of strings are case insensitive
 - Bugfix:   (MBaker)          Work Item GH-275  - Insert New Row/Column Before is not correctly updating formula references
 - Bugfix:   (MBaker)          Work Item GH-257  - Passing an array of cells to _generateRow() in the HTML/PDF Writer causes caching problems with last cell in the range
+- Bugfix:   (MBaker)          Work Item GH-193  - Fix to empty worksheet garbage collection when using cell caching
 - Feature:  (amerov)                            - Implementation of the Excel HLOOKUP() function
 - Feature:  (MBaker)                            - Added "Quote Prefix" to style settings (Excel2007 Reader and Writer only)
 - Feature:  (MBaker)                            - Added Horizontal FILL alignment for Excel5 and Excel2007 Readers/Writers, and Horizontal DISTRIBUTED alignment for Excel2007 Reader/Writer