diff --git a/plugins/DevicesDetection/Archiver.php b/plugins/DevicesDetection/Archiver.php
index ea63485017c9226d352431b5f9b8b3231812b597..a930757174e077cc6ffcb74eeffee801ecf8639d 100644
--- a/plugins/DevicesDetection/Archiver.php
+++ b/plugins/DevicesDetection/Archiver.php
@@ -87,8 +87,9 @@ class Archiver extends \Piwik\Plugin\Archiver
             }
 
             while ($conversionRow = $query->fetch()) {
-
-                $metrics->sumMetricsGoals($conversionRow[$labelSQL], $conversionRow);
+                if (isset($conversionRow[$labelSQL])) {
+                    $metrics->sumMetricsGoals($conversionRow[$labelSQL], $conversionRow);
+                }
             }
             $metrics->enrichMetricsWithConversions();
         }