diff --git a/src/Api.php b/src/Api.php
index c4d0098..6fed3e7 100644
--- a/src/Api.php
+++ b/src/Api.php
@@ -12,6 +12,7 @@ use Log;
 use Zoomyboy\LaravelNami\Backend\Backend;
 use Zoomyboy\LaravelNami\Concerns\IsNamiMember;
 use Zoomyboy\LaravelNami\Cookies\Cookie;
+use Zoomyboy\LaravelNami\Exceptions\RightException;
 use Zoomyboy\LaravelNami\NamiException;
 
 class Api {
@@ -149,6 +150,10 @@ class Api {
 
         Logger::http($url, $response, 'Single Membership '.$membershipId.' from '.$memberId, ['memberId' => $memberId]);
 
+        if($response->json()['success'] === false && Str::startsWith($response['message'], 'Sicherheitsverletzung')) {
+            throw new RightException('');
+        }
+
         return $response->json()['data'];
     }
 
diff --git a/src/Authentication/NamiGuard.php b/src/Authentication/NamiGuard.php
index bf8da36..a956b1a 100644
--- a/src/Authentication/NamiGuard.php
+++ b/src/Authentication/NamiGuard.php
@@ -2,15 +2,15 @@
 
 namespace Zoomyboy\LaravelNami\Authentication;
 
-use Illuminate\Contracts\Auth\Guard;
-use Illuminate\Contracts\Auth\Authenticatable;
-use Zoomyboy\LaravelNami\Nami;
-use Illuminate\Support\Facades\Cache;
-use Zoomyboy\LaravelNami\NamiUser;
-use Illuminate\Contracts\Auth\Authenticatable as AuthenticatableContract;
-use Illuminate\Auth\SessionGuard;
 use Illuminate\Auth\GuardHelpers;
+use Illuminate\Auth\SessionGuard;
+use Illuminate\Contracts\Auth\Authenticatable as AuthenticatableContract;
+use Illuminate\Contracts\Auth\Authenticatable;
+use Illuminate\Contracts\Auth\Guard;
+use Illuminate\Support\Facades\Cache;
 use Illuminate\Support\Str;
+use Zoomyboy\LaravelNami\Nami;
+use Zoomyboy\LaravelNami\NamiUser;
 
 class NamiGuard {
 
diff --git a/src/Exceptions/RightException.php b/src/Exceptions/RightException.php
new file mode 100644
index 0000000..309d265
--- /dev/null
+++ b/src/Exceptions/RightException.php
@@ -0,0 +1,10 @@
+<?php
+
+namespace Zoomyboy\LaravelNami\Exceptions;
+
+use Exception;
+
+class RightException extends Exception
+{
+
+}
diff --git a/src/Member.php b/src/Member.php
index f6bf984..9d32df5 100644
--- a/src/Member.php
+++ b/src/Member.php
@@ -5,6 +5,7 @@ namespace Zoomyboy\LaravelNami;
 use Carbon\Carbon;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Support\LazyCollection;
+use Zoomyboy\LaravelNami\Exceptions\RightException;
 
 class Member extends Model {
 
@@ -140,13 +141,23 @@ class Member extends Model {
 
         return LazyCollection::make(function() use ($memberships) {
             foreach ($memberships as $membership) {
-                yield $this->membership($membership['id']);
+                $m = $this->membership($membership['id']);
+
+                if ($m === null) {
+                    continue;
+                }
+
+                yield $m;
             }
         });
     }
 
-    public function membership($id): Membership {
-        return Membership::fromNami(Nami::membership($this->id, $id));
+    public function membership($id): ?Membership {
+        try {
+            return Membership::fromNami(Nami::membership($this->id, $id));
+        } catch (RightException $e) {
+            return null;
+        }
     }
 
 }