Se agregaron asserts a las entidades

src/StatsBundle/Entity/DeviceServer.php

@@ -55,7 +55,7 @@ class DeviceServer
      */
     private $deviceTypes;
 
-    
+
     /**
      * @return string
      */

src/StatsBundle/Entity/StatsDevice.php

@@ -62,7 +62,6 @@ class StatsDevice
         return sprintf('%s %s', $this->deviceType, $this->ip);
     }
 
-    
     /**
      * @return int
      */