diff --git a/htdocs/main.inc.php b/htdocs/main.inc.php
index 1188dd023ab..2ed8b1a012f 100644
--- a/htdocs/main.inc.php
+++ b/htdocs/main.inc.php
@@ -975,7 +975,7 @@ if (!defined('NOLOGIN')) {
 			// Hooks on failed login
 			$action = '';
 			$hookmanager->initHooks(array('login'));
-			$parameters = array('dol_authmode'=>$dol_authmode, 'dol_loginmesg'=>$_SESSION["dol_loginmesg"]);
+			$parameters = array('dol_authmode' => (isset($dol_authmode) ? $dol_authmode : ''), 'dol_loginmesg' => $_SESSION["dol_loginmesg"]);
 			$reshook = $hookmanager->executeHooks('afterLoginFailed', $parameters, $user, $action); // Note that $action and $object may have been modified by some hooks
 			if ($reshook < 0) {
 				$error++;