diff --git a/htdocs/core/actions_sendmails.inc.php b/htdocs/core/actions_sendmails.inc.php
index b4e583387c9..83a823edeb2 100644
--- a/htdocs/core/actions_sendmails.inc.php
+++ b/htdocs/core/actions_sendmails.inc.php
@@ -345,7 +345,7 @@ if (($action == 'send' || $action == 'relance') && !$_POST['addfile'] && !$_POST
 			$subject = make_substitutions($subject, $substitutionarray);
 			$message = make_substitutions($message, $substitutionarray);
 
-			if (method_exists($object, 'makeSubstitution')) {
+			if (is_object($object) && method_exists($object, 'makeSubstitution')) {
 				$subject = $object->makeSubstitution($subject);
 				$message = $object->makeSubstitution($message);
 			}