diff --git a/lib/classes/UserManagement.class.php b/lib/classes/UserManagement.class.php
index 516c9040a3ae2d222909c741c47e2f50aa4dcddc..67f5ae2b4ae7e1f5a0abaf28f7fb3c337f01543d 100644
--- a/lib/classes/UserManagement.class.php
+++ b/lib/classes/UserManagement.class.php
@@ -1008,7 +1008,7 @@ class UserManagement
 
         if ($delete_names) {
             $query = "UPDATE auth_user_md5
-                      SET username = ?, Vorname = NULL, Nachname = NULL, Email = NULL
+                      SET username = ?, Vorname = '', Nachname = '', Email = ''
                       WHERE user_id = ?";
             $statement = DBManager::get()->prepare($query);
             $statement->execute([