diff --git a/system/libraries/Session/Session.php b/system/libraries/Session/Session.php
index 2551e54..ba1919b 100644
--- a/system/libraries/Session/Session.php
+++ b/system/libraries/Session/Session.php
@@ -143,8 +143,7 @@
 		session_start();
 
 		// Is session ID auto-regeneration configured? (ignoring ajax requests)
-		if ( ! empty($_SERVER['HTTP_X_REQUESTED_WITH'])
-			&& strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) === 'xmlhttprequest'
+		if ((empty($_SERVER['HTTP_X_REQUESTED_WITH']) OR strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) !== 'xmlhttprequest')
 			&& ($regenerate_time = config_item('sess_time_to_update')) > 0
 		)
 		{