Eh ... really fix that notice (#3604)
diff --git a/system/core/Input.php b/system/core/Input.php
index 3e792fc..484397d 100644
--- a/system/core/Input.php
+++ b/system/core/Input.php
@@ -122,6 +122,8 @@
 	 */
 	protected $_input_stream;
 
+	protected $security;
+
 	// --------------------------------------------------------------------
 
 	/**