diff --git a/src/Form/EidConfigForm.php b/src/Form/EidConfigForm.php
index 582706d..f231548 100644
--- a/src/Form/EidConfigForm.php
+++ b/src/Form/EidConfigForm.php
@@ -77,7 +77,7 @@ class EidConfigForm extends ConfigFormBase {
         'mobile_id' => $this->t('Mobile-ID'),
         'smart_id' => $this->t('Smart-ID'),
       ],
-      '#default_value' => $config->get('enabled_auth_methods'),
+      '#default_value' => $config->get('enabled_auth_methods') ?: [],
     ];
 
     $form['mobile_id'] = [