diff --git a/htdocs/compta/facture/card.php b/htdocs/compta/facture/card.php
index 86e21e1518b..f31b0be6a38 100644
--- a/htdocs/compta/facture/card.php
+++ b/htdocs/compta/facture/card.php
@@ -853,7 +853,7 @@ if (empty($reshook))
 	                    foreach($facture_source->lines as $line)
 	                    {
 	                        // Extrafields
-	                        if (empty($conf->global->MAIN_EXTRAFIELDS_DISABLED) && method_exists($lines[$i], 'fetch_optionals')) {
+	                        if (empty($conf->global->MAIN_EXTRAFIELDS_DISABLED) && method_exists($line, 'fetch_optionals')) {
 	                            // load extrafields
 	                            $line->fetch_optionals();
 	                        }