diff --git a/app/Handlers/Events/UserEventHandler.php b/app/Handlers/Events/UserEventHandler.php
index 4390f710ef..7b1f655458 100644
--- a/app/Handlers/Events/UserEventHandler.php
+++ b/app/Handlers/Events/UserEventHandler.php
@@ -84,6 +84,7 @@ class UserEventHandler
      */
     public function saveEmailAddress(DeletedUser $event): bool
     {
+        Preferences::mark();
         $email = hash('sha256', $event->email);
         Log::debug(sprintf('Hash of email is %s', $email));
         /** @var Configuration $configuration */
@@ -94,7 +95,10 @@ class UserEventHandler
         }
         $content[]           = $email;
         $configuration->data = $content;
-        $configuration->save();
+        Log::debug('New content of deleted_users is ', $content);
+        FireflyConfig::set('deleted_users', $content);
+
+        Preferences::mark();
 
         return true;
     }
diff --git a/app/Http/Controllers/Auth/RegisterController.php b/app/Http/Controllers/Auth/RegisterController.php
index 3696f41806..1f3a820676 100755
--- a/app/Http/Controllers/Auth/RegisterController.php
+++ b/app/Http/Controllers/Auth/RegisterController.php
@@ -100,6 +100,8 @@ class RegisterController extends Controller
         $hash          = hash('sha256', $data['email']);
         $configuration = FireflyConfig::get('deleted_users', []);
         $set           = $configuration->data;
+        Log::debug(sprintf('Hash of email is %s', $hash));
+        Log::debug('Hashes of deleted users: ', $set);
         if (in_array($hash, $set)) {
             // user already deleted, cannot re-register :(
             $validator->getMessageBag()->add('email', (string)trans('validation.deleted_user'));
@@ -108,6 +110,7 @@ class RegisterController extends Controller
         }
 
 
+
         $user = $this->create($request->all());
 
         // trigger user registration event:
diff --git a/app/Support/FireflyConfig.php b/app/Support/FireflyConfig.php
index c2bd7800f7..9e42c6de17 100644
--- a/app/Support/FireflyConfig.php
+++ b/app/Support/FireflyConfig.php
@@ -91,12 +91,12 @@ class FireflyConfig
     }
 
     /**
-     * @param        $name
-     * @param string $value
+     * @param string $name
+     * @param        $value
      *
      * @return Configuration
      */
-    public function set($name, $value): Configuration
+    public function set(string $name, $value): Configuration
     {
         Log::debug('Set new value for ', ['name' => $name]);
         $config = Configuration::whereName($name)->first();