diff --git a/htdocs/ticket/list.php b/htdocs/ticket/list.php
index 97bcef197e6..1b3e035e37d 100644
--- a/htdocs/ticket/list.php
+++ b/htdocs/ticket/list.php
@@ -560,7 +560,7 @@ if ($projectid > 0 || $project_ref) {
 		// Title
 		$morehtmlref .= $object->title;
 		// Thirdparty
-		if (!empty($object->thirdparty) && $object->thirdparty->id > 0) {
+		if (!empty($object->thirdparty->id) && $object->thirdparty->id > 0) {
 			$morehtmlref .= '<br>'.$langs->trans('ThirdParty').' : '.$object->thirdparty->getNomUrl(1, 'project');
 		}
 		$morehtmlref .= '</div>';