fix #5545
diff --git a/system/libraries/Session/drivers/Session_files_driver.php b/system/libraries/Session/drivers/Session_files_driver.php
index 654f300..f5925d5 100644
--- a/system/libraries/Session/drivers/Session_files_driver.php
+++ b/system/libraries/Session/drivers/Session_files_driver.php
@@ -402,9 +402,11 @@
 	 * @param	string	$id
 	 * @return	bool
 	 */
-	public function validateId($id)
+	public function validateSessionId($id)
 	{
-		return is_file($this->_file_path.$id);
+		$result = is_file($this->_file_path.$id);
+		clearstatcache(TRUE, $this->_file_path.$id);
+		return $result;
 	}
 
 	// --------------------------------------------------------------------