diff --git a/htdocs/cashdesk/class/Facturation.class.php b/htdocs/cashdesk/class/Facturation.class.php
index 07d514b95f1..bb6d94e9788 100644
--- a/htdocs/cashdesk/class/Facturation.class.php
+++ b/htdocs/cashdesk/class/Facturation.class.php
@@ -142,7 +142,11 @@ class Facturation
         $this->montantRemise($montant_remise_ht);
 
         $newcartarray=$_SESSION['poscart'];
-        $i=count($newcartarray);
+
+        $i = 0;
+        if (!is_null($newcartarray) && !is_empty($newcartarray)) {
+            $i=count($newcartarray);	
+        }
 
         $newcartarray[$i]['id']=$i;
         $newcartarray[$i]['ref']=$product->ref;