diff --git a/Service/LanguageService.php b/Service/LanguageService.php
index de9b8cc..49c0258 100644
--- a/Service/LanguageService.php
+++ b/Service/LanguageService.php
@@ -34,7 +34,11 @@ public function __construct(ModelManager $modelManager)
      */
     public function getLanguages()
     {
-        $fetchedShopLocaleIds = \array_unique($this->fetchShopLocaleIds());
+        $fetchedShopLocaleIds = \array_unique(\array_merge(
+            $this->fetchShopLocaleIds(),
+            $this->fetchCustomerLocaleIds()
+        ));
+
         $locales = $this->fetchLocales($fetchedShopLocaleIds);
 
         return $this->appendAssociatedData($locales);
@@ -76,6 +80,19 @@ private function fetchShopLocaleIds()
         return $query->execute()->fetchAll(\PDO::FETCH_COLUMN);
     }
 
+    /**
+     * @return array<int, string>
+     */
+    private function fetchCustomerLocaleIds()
+    {
+        $query = $this->connection->createQueryBuilder();
+        $query->from('s_user', 'customer');
+        $query->addSelect('DISTINCT customer.language');
+        $query->where('customer.language IS NOT NULL');
+
+        return $query->execute()->fetchAll(\PDO::FETCH_COLUMN);
+    }
+
     /**
      * @return array
      */
diff --git a/Tests/Functional/Service/LanguageServiceTest.php b/Tests/Functional/Service/LanguageServiceTest.php
new file mode 100644
index 0000000..dd21b5c
--- /dev/null
+++ b/Tests/Functional/Service/LanguageServiceTest.php
@@ -0,0 +1,61 @@
+<?php
+/**
+ * (c) shopware AG <info@shopware.com>
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace SwagMigrationConnector\Tests\Functional\Service;
+
+use Doctrine\DBAL\Connection;
+use PHPUnit\Framework\TestCase;
+use SwagMigrationConnector\Tests\Functional\DatabaseTransactionTrait;
+
+class LanguageServiceTest extends TestCase
+{
+    use DatabaseTransactionTrait;
+
+    /**
+     * @var Connection
+     */
+    private $connection;
+
+    /**
+     * @return void
+     */
+    public function testReadIncludesCustomerLocalesOutsideShopLocales()
+    {
+        $localeId = (int) $this->connection->fetchColumn('SELECT COALESCE(MAX(id), 0) + 1 FROM s_core_locales');
+        $customerId = $this->connection->fetchColumn('SELECT id FROM s_user ORDER BY id ASC LIMIT 1');
+
+        static::assertTrue($customerId !== false);
+
+        $this->connection->insert('s_core_locales', [
+            'id' => $localeId,
+            'locale' => 'zz_ZZ',
+            'language' => 'Test language',
+            'territory' => 'Test territory',
+        ]);
+
+        $this->connection->update(
+            's_user',
+            ['language' => (string) $localeId],
+            ['id' => (int) $customerId]
+        );
+
+        $languageService = $this->getContainer()->get('swag_migration_connector.service.language_service');
+        $languages = $languageService->getLanguages();
+
+        static::assertContains('zz-ZZ', \array_column($languages, 'locale'));
+    }
+
+    /**
+     * @before
+     *
+     * @return void
+     */
+    protected function setUpMethod()
+    {
+        $this->connection = $this->getContainer()->get('dbal_connection');
+    }
+}
diff --git a/plugin.xml b/plugin.xml
index 54198b5..3769269 100644
--- a/plugin.xml
+++ b/plugin.xml
@@ -19,6 +19,15 @@
         The Migration Connector provides API endpoints that allow Shopware 6 to create a secure data connection with the active Shopware 5 shop which support the data migration to Shopware 6.
     </description>
 
+    <changelog version="NEXT">
+        <changes lang="de">
+            Migration von Kundensprachen korrigiert, wenn diese keinem Shop zugewiesen sind;
+        </changes>
+        <changes lang="en">
+            Fixed customer language migration when customer locales are not assigned to a shop;
+        </changes>
+    </changelog>
+
     <changelog version="2.2.0">
         <changes lang="de">
             #13670 - Die Umgebungsinformationen wurden angepasst, um einige Konfigurationswerte zurückzugeben, die die SW5-Installation eindeutig identifizieren. SW6 verwendet diese, um davor zu warnen, mehr als einmal Verbindungen zum selben Quellsystem herzustellen;