Stop event propagation on empty username

login-ldap.php

@@ -71,9 +71,10 @@ class LoginLDAPPlugin extends Plugin
     {
         $credentials = $event->getCredentials();
 
-        // empty username -> ignore
+        // Fail early on empty username
         if($credentials['username'] == ''){
             $event->setStatus($event::AUTHENTICATION_FAILURE);
+            $event->stopPropagation();
             return;
         }