fix update script

copy_this/modules/d3/d3_googleanalytics/models/d3_googleanalytics_update.php

@@ -83,6 +83,9 @@ jQ9';
                     'oxmodid'       => $this->sModKey,
                     'oxshopid'      => $oShop->getId(),
                 );
+
+                if ($this->_checkTableItemNotExist('d3_cfg_mod', $aWhere))
+                {
                     $aInsertFields = array(
                         'OXID'           => array(
                             'content'       =>  "md5('" . $this->sModKey . " " . $oShop->getId() . " de')",
@@ -145,6 +148,7 @@ jQ9';
                     }
                 }
             }
+        }
         return $blRet;
     }