diff --git a/lib/Models/Model.php b/lib/Models/Model.php
index 6eccc06c3e..6528d23f6b 100644
--- a/lib/Models/Model.php
+++ b/lib/Models/Model.php
@@ -16,15 +16,15 @@ class Model extends \Sudzy\ValidModel {
       parent::save();
       return true;
     } catch (\Sudzy\ValidationException $e) {
-      return false;
+      return array_unique($e->getValidationErrors());
     } catch (\PDOException $e) {
-      return false;
+      return $e->getMessage();
     }
   }
 
   private function setTimestamp() {
     if ($this->created_at === null) {
-      $this->created_at = date("Y-m-d H:i:s");
+      $this->created_at = date('Y-m-d H:i:s');
     }
   }
 }
diff --git a/lib/Models/Subscriber.php b/lib/Models/Subscriber.php
index c2ca8d9876..6f9d3adcab 100644
--- a/lib/Models/Subscriber.php
+++ b/lib/Models/Subscriber.php
@@ -83,12 +83,7 @@ class Subscriber extends Model {
     }
 
     $subscriber->hydrate($data);
-    $saved = $subscriber->save();
+    return $subscriber->save();
 
-    if($saved === false) {
-      return $subscriber->getValidationErrors();
-    } else {
-      return true;
-    }
   }
 }
diff --git a/lib/Router/Newsletters.php b/lib/Router/Newsletters.php
index f98c0f721a..826ca76ef0 100644
--- a/lib/Router/Newsletters.php
+++ b/lib/Router/Newsletters.php
@@ -27,13 +27,8 @@ class Newsletters {
   function save($args) {
     $model = Newsletter::create();
     $model->hydrate($args);
-    $saved = $model->save();
-
-    if(!$saved) {
-      wp_send_json($model->getValidationErrors());
-    }
-
-    wp_send_json(true);
+    $result = $model->save();
+    wp_send_json($result);
   }
 
   function update($args) {
diff --git a/lib/Router/Segments.php b/lib/Router/Segments.php
index ea42a18764..7fc0da1777 100644
--- a/lib/Router/Segments.php
+++ b/lib/Router/Segments.php
@@ -25,13 +25,8 @@ class Segments {
   function save($args) {
     $model = Segment::create();
     $model->hydrate($args);
-    $saved = $model->save();
-
-    if(!$saved) {
-      wp_send_json($model->getValidationErrors());
-    }
-
-    wp_send_json(true);
+    $result = $model->save();
+    wp_send_json($result);
   }
 
   function update($args) {
diff --git a/lib/Router/Subscribers.php b/lib/Router/Subscribers.php
index 2b635430c8..efd41d7c9c 100644
--- a/lib/Router/Subscribers.php
+++ b/lib/Router/Subscribers.php
@@ -1,7 +1,8 @@
 <?php
 namespace MailPoet\Router;
-use \MailPoet\Models\Subscriber;
-use \MailPoet\Listing;
+
+use MailPoet\Listing;
+use MailPoet\Models\Subscriber;
 
 if(!defined('ABSPATH')) exit;
 
@@ -10,7 +11,7 @@ class Subscribers {
   }
 
   function get($data = array()) {
-    $id = (isset($data['id']) ? (int)$data['id'] : 0);
+    $id = (isset($data['id']) ? (int) $data['id'] : 0);
 
     $subscriber = Subscriber::findOne($id);
     if($subscriber === false) {
@@ -35,12 +36,7 @@ class Subscribers {
 
   function save($data = array()) {
     $result = Subscriber::createOrUpdate($data);
-
-    if($result !== true) {
-      wp_send_json($result);
-    } else {
-      wp_send_json(true);
-    }
+    wp_send_json($result);
   }
 
   function update($data) {
diff --git a/tests/acceptance/NewslettersPageCest.php b/tests/acceptance/NewslettersPageCest.php
index 7c82b2d4a7..102423a4cb 100644
--- a/tests/acceptance/NewslettersPageCest.php
+++ b/tests/acceptance/NewslettersPageCest.php
@@ -17,7 +17,7 @@ class NewslettersPageCest {
   }
   
   function iCanAddNewsletterFromListingPage(AcceptanceTester $I) {
-    $I->see('No newsletters found');
+    $I->waitForElement('.no-items', $this->waitTime);
     $I->click('New', '#newsletters');
     $I->fillField('Subject', 'first newsletter');
     $I->fillField('Body', 'some body');
diff --git a/tests/unit/Models/SegmentCest.php b/tests/unit/Models/SegmentCest.php
index 6fa9c755ea..3828e650ab 100644
--- a/tests/unit/Models/SegmentCest.php
+++ b/tests/unit/Models/SegmentCest.php
@@ -23,7 +23,7 @@ class SegmentCest {
   function itHasToBeValid() {
     expect($this->saved)->equals(true);
     $empty_model = Segment::create();
-    expect($empty_model->save())->equals(false);
+    expect($empty_model->save())->notEquals(true);
     $validations = $empty_model->getValidationErrors();
     expect(count($validations))->equals(2);
   }
diff --git a/tests/unit/Models/SettingCest.php b/tests/unit/Models/SettingCest.php
index d4e8de8f10..55f82a22bc 100644
--- a/tests/unit/Models/SettingCest.php
+++ b/tests/unit/Models/SettingCest.php
@@ -21,7 +21,7 @@ class SettingCest {
   function itHasToBeValid() {
     expect($this->result)->equals(true);
     $empty_model = Setting::create();
-    expect($empty_model->save())->equals(false);
+    expect($empty_model->save())->notEquals(true);
     $validations = $empty_model->getValidationErrors();
     expect(count($validations))->equals(4);
   }
diff --git a/tests/unit/Models/SubscriberCest.php b/tests/unit/Models/SubscriberCest.php
index 674e1c83ea..6edf90bcda 100644
--- a/tests/unit/Models/SubscriberCest.php
+++ b/tests/unit/Models/SubscriberCest.php
@@ -50,7 +50,7 @@ class SubscriberCest {
     $conflict_subscriber = Subscriber::create();
     $conflict_subscriber->hydrate($this->data);
     $saved = $conflict_subscriber->save();
-    expect($saved)->equals(false);
+    expect($saved)->notEquals(true);
   }
 
   function itHasAStatus() {