Fix #3633
diff --git a/system/core/Input.php b/system/core/Input.php
index 484397d..be9f3c1 100644
--- a/system/core/Input.php
+++ b/system/core/Input.php
@@ -123,6 +123,7 @@
 	protected $_input_stream;
 
 	protected $security;
+	protected $uni;
 
 	// --------------------------------------------------------------------