diff --git a/htdocs/compta/facture/class/facture.class.php b/htdocs/compta/facture/class/facture.class.php
index 3c4bfec6a45..60970b5b1e2 100644
--- a/htdocs/compta/facture/class/facture.class.php
+++ b/htdocs/compta/facture/class/facture.class.php
@@ -486,7 +486,8 @@ class Facture extends CommonInvoice
 				        foreach ($exp->linkedObjectsIds['commande'] as $key => $value)
 				        {
 				            $originforcontact = 'commande';
-				            $originidforcontact = $value;
+				            if (is_object($value)) $originidforcontact = $value->id;
+				            else $originidforcontact = $value;
 				            break; // We take first one
 				        }
 				    }