diff --git a/src/Service/AccessStorage.php b/src/Service/AccessStorage.php
index 5517653..ace7eb3 100644
--- a/src/Service/AccessStorage.php
+++ b/src/Service/AccessStorage.php
@@ -328,7 +328,7 @@ class AccessStorage {
    *   The user ids which have been submitted.
    */
   public function getSubmittedUserIds($formState) {
-    $sRawUsers = $this->requestStack->getCurrentRequest()->request->all()['access']['user'];
+    $sRawUsers = $this->requestStack->getCurrentRequest()->request->all()['access']['user'] ?? [];
 
     if (empty($sRawUsers)) {
       return [];