diff --git a/htdocs/core/class/commondocgenerator.class.php b/htdocs/core/class/commondocgenerator.class.php
index 6ac96190245..937634de5d4 100644
--- a/htdocs/core/class/commondocgenerator.class.php
+++ b/htdocs/core/class/commondocgenerator.class.php
@@ -421,7 +421,7 @@ abstract class CommonDocGenerator
 		// Fetch project information if there is a project assigned to this object
 		if ($object->element != "project" && ! empty($object->fk_project) && $object->fk_project > 0)
 		{
-			if(!isset($object->project))
+			if (! is_object($object->project))
 			{
 				$object->fetch_projet();
 			}