diff --git a/templates/selectsource.twig b/templates/selectsource.twig
index ccf9ea8e9e4e5129b43103765d70f16b924c5d30..1aa662676003d8e2910e5e593d9297b980dcf6a9 100644
--- a/templates/selectsource.twig
+++ b/templates/selectsource.twig
@@ -19,7 +19,8 @@
     <script src="/{{baseurlpath}}module.php/campusmultiauth/resources/jquery-3.6.0.min.js"></script>
     <script src="/{{baseurlpath}}module.php/campusmultiauth/resources/selectize/js/standalone/selectize.min.js"></script>
 
-    <meta name="idphint" value="{% if idphint is defined %}{{ idphint | json_encode }}{% endif %}">
+    {% if idphint is not defined %}{% set idphint = [] %}{% endif %}
+    <meta name="idphint" content="{{ idphint | json_encode }}">
 
     <script src="/{{baseurlpath}}module.php/campusmultiauth/resources/campus-idp.js"></script>
 {% endblock %}