diff --git a/htdocs/compta/facture/card.php b/htdocs/compta/facture/card.php
index 8f65df86da7..be552526e1f 100644
--- a/htdocs/compta/facture/card.php
+++ b/htdocs/compta/facture/card.php
@@ -3901,7 +3901,7 @@ if ($action == 'create') {
 		print $objectsrc->getNomUrl(1);
 		// We check if Origin document (id and type is known) has already at least one invoice attached to it
 		$objectsrc->fetchObjectLinked($originid, $origin, '', 'facture');
-		if (is_array($objectsrc->linkedObjects['facture']) && count($objectsrc->linkedObjects['facture']) >= 1) {
+		if (isset($objectsrc->linkedObjects['facture']) && is_array($objectsrc->linkedObjects['facture']) && count($objectsrc->linkedObjects['facture']) >= 1) {
 			setEventMessages('WarningBillExist', null, 'warnings');
 			echo ' - '.$langs->trans('LatestRelatedBill').' '.end($objectsrc->linkedObjects['facture'])->getNomUrl(1);
 		}