I think this return is needed to prevent sending the i18n query results twice and crashing the server.

server/commons/Handler.coffee

@@ -121,6 +121,7 @@ module.exports = class Handler
         return @sendDatabaseError(res, err) if err
         documents = (@formatEntity(req, doc) for doc in documents)
         @sendSuccess(res, documents)
+      return
 
     specialParameters = ['term', 'project', 'conditions']