diff --git a/Models/NewsArticle.php b/Models/NewsArticle.php
index cd21f20..e663a15 100755
--- a/Models/NewsArticle.php
+++ b/Models/NewsArticle.php
@@ -484,14 +484,6 @@ class NewsArticle implements \JsonSerializable, ArrayableInterface
         ];
     }
 
-    /**
-     * {@inheritdoc}
-     */
-    public function __toString()
-    {
-        return (string) \json_encode($this->toArray());
-    }
-
     /**
      * {@inheritdoc}
      */
diff --git a/tests/Controller/ApiControllerTest.php b/tests/Controller/ApiControllerTest.php
index 162084f..58f7b76 100755
--- a/tests/Controller/ApiControllerTest.php
+++ b/tests/Controller/ApiControllerTest.php
@@ -47,7 +47,6 @@ class ControllerTest extends \PHPUnit\Framework\TestCase
 
         $this->app->dbPool         = $GLOBALS['dbpool'];
         $this->app->orgId          = 1;
-        $this->app->appName        = 'Backend';
         $this->app->accountManager = new AccountManager($GLOBALS['session']);
         $this->app->appSettings    = new CoreSettings($this->app->dbPool->get());
         $this->app->moduleManager  = new ModuleManager($this->app, __DIR__ . '/../../../Modules');
diff --git a/tests/Models/NullNewsArticleTest.php b/tests/Models/NullNewsArticleTest.php
new file mode 100644
index 0000000..139c657
--- /dev/null
+++ b/tests/Models/NullNewsArticleTest.php
@@ -0,0 +1,42 @@
+<?php
+/**
+ * Orange Management
+ *
+ * PHP Version 7.4
+ *
+ * @package   tests
+ * @copyright Dennis Eichhorn
+ * @license   OMS License 1.0
+ * @version   1.0.0
+ * @link      https://orange-management.org
+ */
+declare(strict_types=1);
+
+namespace Modules\News\tests\Models;
+
+use Modules\News\Models\NullNewsArticle;
+
+/**
+ * @internal
+ */
+final class NullNewsArticleTest extends \PHPUnit\Framework\TestCase
+{
+    /**
+     * @covers Modules\News\Models\NullNewsArticle
+     * @group module
+     */
+    public function testNull() : void
+    {
+        self::assertInstanceOf('\Modules\News\Models\NewsArticle', new NullNewsArticle());
+    }
+
+    /**
+     * @covers Modules\News\Models\NullNewsArticle
+     * @group module
+     */
+    public function testId() : void
+    {
+        $null = new NullNewsArticle(2);
+        self::assertEquals(2, $null->getId());
+    }
+}