diff --git a/lib/app.js b/lib/app.js
index 7b49e81e..2dedc726 100644
--- a/lib/app.js
+++ b/lib/app.js
@@ -74,14 +74,13 @@ module.exports = function (options) {
 
       config.isAuthorized(fingerprint, function (err, device) {
         if (err) { 
-          var serverError = new Error('Internal Server Error');
-          serverError.status = 500;
-          return next(serverError); 
+          res.json({err: 'Internal Server Error'});
+          return next(err); 
         }
         if (!device) {
-          var pairError = new Error('Not Found');
-          pairError.status = 404;
-          return next(pairError); 
+          res.statusCode = 404;
+          res.json({err: 'Not Found'});
+          return next(new Error('Device is unpaired')); 
         }
         next();
       });
diff --git a/package.json b/package.json
index 7010488c..bda209d5 100644
--- a/package.json
+++ b/package.json
@@ -2,7 +2,7 @@
   "name": "lamassu-server",
   "description": "bitcoin atm client server protocol module",
   "keywords": [],
-  "version": "0.4.5",
+  "version": "0.4.6",
   "license": "unlicense",
   "author": "Lamassu (https://lamassu.is)",
   "engines": {