diff --git a/htdocs/core/lib/functions.lib.php b/htdocs/core/lib/functions.lib.php
index 18d98ffd8a0..85b930ae654 100644
--- a/htdocs/core/lib/functions.lib.php
+++ b/htdocs/core/lib/functions.lib.php
@@ -6260,7 +6260,7 @@ function getCommonSubstitutionArray($outputlangs, $onlykey = 0, $exclude = null,
 			$substitutionarray['__REFCLIENT__'] = (isset($object->ref_client) ? $object->ref_client : (isset($object->ref_customer) ? $object->ref_customer : null));
 			$substitutionarray['__REFSUPPLIER__'] = (isset($object->ref_supplier) ? $object->ref_supplier : null);
 			$substitutionarray['__SUPPLIER_ORDER_DATE_DELIVERY__'] = (isset($object->date_livraison) ? dol_print_date($object->date_livraison, 'day', 0, $outputlangs) : '');
-			$substitutionarray['__SUPPLIER_ORDER_DELAY_DELIVERY__'] = $outputlangs->transnoentities("AvailabilityType".$object->availability_code) != ('AvailabilityType'.$object->availability_code) ? $outputlangs->transnoentities("AvailabilityType".$object->availability_code) : $outputlangs->convToOutputCharset(isset($object->availability) ? $object->availability : '');
+			$substitutionarray['__SUPPLIER_ORDER_DELAY_DELIVERY__'] = (isset($object->availability_code) ? ($outputlangs->transnoentities("AvailabilityType".$object->availability_code) != ('AvailabilityType'.$object->availability_code) ? $outputlangs->transnoentities("AvailabilityType".$object->availability_code) : $outputlangs->convToOutputCharset(isset($object->availability) ? $object->availability : '')) : '');
 
 			$birthday = dol_print_date($object->birth, 'day');