diff --git a/Classes/PHPExcel/CachedObjectStorage/SQLite.php b/Classes/PHPExcel/CachedObjectStorage/SQLite.php
index 6a74f58..ddbdb8e 100644
--- a/Classes/PHPExcel/CachedObjectStorage/SQLite.php
+++ b/Classes/PHPExcel/CachedObjectStorage/SQLite.php
@@ -42,7 +42,8 @@ class PHPExcel_CachedObjectStorage_SQLite extends PHPExcel_CachedObjectStorage_C
 		if ($this->_currentCellIsDirty) {
 			$this->_currentObject->detach();
 
-			$this->_DBHandle->queryExec("INSERT OR REPLACE INTO kvp_".$this->_TableName." VALUES('".$this->_currentObjectID."','".sqlite_escape_string(serialize($this->_currentObject))."')");
+			if (!$this->_DBHandle->queryExec("INSERT OR REPLACE INTO kvp_".$this->_TableName." VALUES('".$this->_currentObjectID."','".sqlite_escape_string(serialize($this->_currentObject))."')"))
+				throw new Exception(sqlite_error_string($this->_DBHandle->lastError()));
 			$this->_currentCellIsDirty = false;
 		}
 		$this->_currentObjectID = $this->_currentObject = null;
@@ -85,7 +86,9 @@ class PHPExcel_CachedObjectStorage_SQLite extends PHPExcel_CachedObjectStorage_C
 
 		$query = "SELECT value FROM kvp_".$this->_TableName." WHERE id='".$pCoord."'";
 		$cellResultSet = $this->_DBHandle->query($query,SQLITE_ASSOC);
-		if ($cellResultSet->numRows() == 0) {
+		if ($cellResultSet === false) {
+			throw new Exception(sqlite_error_string($this->_DBHandle->lastError()));
+		} elseif ($cellResultSet->numRows() == 0) {
 			//	Return null if requested entry doesn't exist in cache
 			return null;
 		}
@@ -117,7 +120,9 @@ class PHPExcel_CachedObjectStorage_SQLite extends PHPExcel_CachedObjectStorage_C
 		//	Check if the requested entry exists in the cache
 		$query = "SELECT id FROM kvp_".$this->_TableName." WHERE id='".$pCoord."'";
 		$cellResultSet = $this->_DBHandle->query($query,SQLITE_ASSOC);
-		if ($cellResultSet->numRows() == 0) {
+		if ($cellResultSet === false) {
+			throw new Exception(sqlite_error_string($this->_DBHandle->lastError()));
+		} elseif ($cellResultSet->numRows() == 0) {
 			//	Return null if requested entry doesn't exist in cache
 			return false;
 		}
@@ -139,7 +144,8 @@ class PHPExcel_CachedObjectStorage_SQLite extends PHPExcel_CachedObjectStorage_C
 
 		//	Check if the requested entry exists in the cache
 		$query = "DELETE FROM kvp_".$this->_TableName." WHERE id='".$pCoord."'";
-		$this->_DBHandle->queryExec($query);
+		if (!$this->_DBHandle->queryExec($query))
+			throw new Exception(sqlite_error_string($this->_DBHandle->lastError()));
 
 		$this->_currentCellIsDirty = false;
 	}	//	function deleteCacheData()
@@ -153,6 +159,8 @@ class PHPExcel_CachedObjectStorage_SQLite extends PHPExcel_CachedObjectStorage_C
 	public function getCellList() {
 		$query = "SELECT id FROM kvp_".$this->_TableName;
 		$cellIdsResult = $this->_DBHandle->unbufferedQuery($query,SQLITE_ASSOC);
+		if ($cellIdsResult === false)
+			throw new Exception(sqlite_error_string($this->_DBHandle->lastError()));
 
 		$cellKeys = array();
 		foreach($cellIdsResult as $row) {
@@ -171,8 +179,9 @@ class PHPExcel_CachedObjectStorage_SQLite extends PHPExcel_CachedObjectStorage_C
 	public function copyCellCollection(PHPExcel_Worksheet $parent) {
 		//	Get a new id for the new table name
 		$tableName = str_replace('.','_',$this->_getUniqueID());
-		$this->_DBHandle->queryExec('CREATE TABLE kvp_'.$tableName.' (id VARCHAR(12) PRIMARY KEY, value BLOB)
-		                                       AS SELECT * FROM kvp_'.$this->_TableName);
+		if (!$this->_DBHandle->queryExec('CREATE TABLE kvp_'.$tableName.' (id VARCHAR(12) PRIMARY KEY, value BLOB)
+													AS SELECT * FROM kvp_'.$this->_TableName))
+			throw new Exception(sqlite_error_string($this->_DBHandle->lastError()));
 
 		//	Copy the existing cell cache file
 		$this->_TableName = $tableName;
@@ -199,7 +208,10 @@ class PHPExcel_CachedObjectStorage_SQLite extends PHPExcel_CachedObjectStorage_C
 			$_DBName = ':memory:';
 
 			$this->_DBHandle = new SQLiteDatabase($_DBName);
-			$this->_DBHandle->queryExec('CREATE TABLE kvp_'.$this->_TableName.' (id VARCHAR(12) PRIMARY KEY, value BLOB)');
+			if ($this->_DBHandle === false)
+				throw new Exception(sqlite_error_string($this->_DBHandle->lastError()));
+			if (!$this->_DBHandle->queryExec('CREATE TABLE kvp_'.$this->_TableName.' (id VARCHAR(12) PRIMARY KEY, value BLOB)'))
+				throw new Exception(sqlite_error_string($this->_DBHandle->lastError()));
 		}
 	}	//	function __construct()