diff --git a/modules/multiauth/lib/Auth/Source/MultiAuth.php b/modules/multiauth/lib/Auth/Source/MultiAuth.php
index 4fa78625242794485ee5838a07730674e3b8fd91..abdf6064464af58700dd4220d55f1100e5a8b2c2 100644
--- a/modules/multiauth/lib/Auth/Source/MultiAuth.php
+++ b/modules/multiauth/lib/Auth/Source/MultiAuth.php
@@ -74,6 +74,8 @@ class MultiAuth extends \SimpleSAML\Auth\Source
 
             if (array_key_exists('help', $info)) {
                 $help = $info['help'];
+            } else {
+                $help = null;
             }
             if (array_key_exists('css-class', $info)) {
                 $css_class = $info['css-class'];