diff --git a/lib/validatorClass.php b/lib/validatorClass.php
index ca0bf42406143a11cb3e4d5abc15ff3918eb97b8..bd5abb3caf229f14a9a844ff64e2ca53237e3507 100644
--- a/lib/validatorClass.php
+++ b/lib/validatorClass.php
@@ -280,6 +280,7 @@ class Validator {
     public function checkmetadata() {
         $params = $this->params;
         $schres = 0;
+        $certidx = -1;
         if ( ($params['validate'] || $params['entities']) && ($params['url'] != "") ) {
         $ret = $this->get_data();
         if ($ret[0] == 304) {