Fixing a bug in the form_helper where csrf_token_name and csrf_hash were referencing class properties in the Security class that were moved.
diff --git a/system/helpers/form_helper.php b/system/helpers/form_helper.php
index 8aa788c..acd75c2 100644
--- a/system/helpers/form_helper.php
+++ b/system/helpers/form_helper.php
@@ -67,7 +67,7 @@
 		// CSRF
 		if ($CI->config->item('csrf_protection') === TRUE)
 		{
-			$hidden[$CI->security->csrf_token_name] = $CI->security->csrf_hash;
+			$hidden[$CI->security->get_csrf_token_name()] = $CI->security->get_csrf_hash();
 		}
 
 		if (is_array($hidden) AND count($hidden) > 0)