diff --git a/app/src/Controller/User/RegisterUserAction.php b/app/src/Controller/User/RegisterUserAction.php
index 7e7c006..c5a445f 100644
--- a/app/src/Controller/User/RegisterUserAction.php
+++ b/app/src/Controller/User/RegisterUserAction.php
@@ -21,7 +21,8 @@ class RegisterUserAction extends Controller
         $requestData = $this->request->getParsedBody();
 
         if ($requestData['password'] !== $requestData['checked_password']) {
-            $this->session->getFlash()->add('error', "Passwords do not match.");
+            $this->session->getFlash()
+                          ->add('error', "Passwords do not match.");
             $response = $this->render('user/register.twig');
             return $response->withStatus(400);
         }
diff --git a/app/tests/Controller/User/RegisterUserActionTest.php b/app/tests/Controller/User/RegisterUserActionTest.php
index 539ba1c..31dfc33 100644
--- a/app/tests/Controller/User/RegisterUserActionTest.php
+++ b/app/tests/Controller/User/RegisterUserActionTest.php
@@ -54,7 +54,6 @@ class RegisterUserActionTest extends TestCase
     public function testFailingRegistration(): void
     {
         $user = $this->getUser();
-
         $app = $this->getAppInstance();
 
         /** @var $container \DI\Container */
@@ -75,7 +74,7 @@ class RegisterUserActionTest extends TestCase
         $flash = $container->get(SessionInterface::class)->getFlash();
         $errorMessages = $flash->get('error');
         $this->assertIsArray($errorMessages);
-        $this->assertNotNull($errorMessages);
-        $this->assertEquals('Unable to register user.', $errorMessage[0]);
+        $this->assertNotEmpty($errorMessages);
+        $this->assertEquals('Unable to register user.', $errorMessages[0]);
     }
 }