diff --git a/htdocs/ticket/list.php b/htdocs/ticket/list.php
index 2566ee81073..97bcef197e6 100644
--- a/htdocs/ticket/list.php
+++ b/htdocs/ticket/list.php
@@ -390,7 +390,7 @@ foreach ($search as $key => $val) {
 		}
 		continue;
 	}
-	$mode_search = (($object->isInt($object->fields[$key]) || $object->isFloat($object->fields[$key])) ? 1 : 0);
+	$mode_search = ((!empty($object->fields[$key]) && ($object->isInt($object->fields[$key]) || $object->isFloat($object->fields[$key]))) ? 1 : 0);
 	if ($search[$key] != '') {
 		$sql .= natural_search($key, $search[$key], $mode_search);
 	}
@@ -560,7 +560,7 @@ if ($projectid > 0 || $project_ref) {
 		// Title
 		$morehtmlref .= $object->title;
 		// Thirdparty
-		if ($object->thirdparty->id > 0) {
+		if (!empty($object->thirdparty) && $object->thirdparty->id > 0) {
 			$morehtmlref .= '<br>'.$langs->trans('ThirdParty').' : '.$object->thirdparty->getNomUrl(1, 'project');
 		}
 		$morehtmlref .= '</div>';