From aa36b577d603d0b5ae0baeddc06630139d523371 Mon Sep 17 00:00:00 2001
From: Thomas Lutz <thomaslutz.de@googlemail.com>
Date: Fri, 1 Aug 2014 13:16:13 +0200
Subject: [PATCH] Fixed bug with offset

---
 SEOstats/Services/Sistrix.php | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/SEOstats/Services/Sistrix.php b/SEOstats/Services/Sistrix.php
index db7b7730..26c775d3 100644
--- a/SEOstats/Services/Sistrix.php
+++ b/SEOstats/Services/Sistrix.php
@@ -49,9 +49,12 @@ public static function getVisibilityIndex($url = false)
         $html = parent::_getPage($dataUrl);
         @preg_match_all('#<h3>(.*?)<\/h3>#si', $html, $matches);
 
-        $vi = str_replace(',','.',$matches[1][0]);
-
-        return isset($vi) ? $vi : parent::noDataDefaultValue();
+        if(isset($matches[1][0])) {
+          $vi = str_replace(',','.',$matches[1][0]);
+          return $vi;
+        } else {
+          return parent::noDataDefaultValue();
+        }
     }
 
     /**