+// Access checks.
+if (!ttAccessAllowed('manage_custom_fields')) {
+ header('Location: access_denied.php');
+ exit();
+}
+if (!$user->isPluginEnabled('cf')) {
+ header('Location: feature_disabled.php');
+ exit();
+}
+$fields = CustomFields::getFields();
+// Deny access when max number of custom fields is already set.
+if (count($fields) >= 1) {