diff --git a/htdocs/core/class/commondocgenerator.class.php b/htdocs/core/class/commondocgenerator.class.php
index 82012400f68..e1780985c7c 100644
--- a/htdocs/core/class/commondocgenerator.class.php
+++ b/htdocs/core/class/commondocgenerator.class.php
@@ -1288,7 +1288,8 @@ abstract class CommonDocGenerator
 		}
 		$extrafields = $this->extrafieldsCache;
 
-		$extrafieldOutputContent = $extrafields->showOutputField($extrafieldKey, $object->array_options[$extrafieldOptionsKey], '', $object->table_element);
+		$extrafieldOutputContent = '';
+		if (isset($object->array_options[$extrafieldOptionsKey])) $extrafieldOutputContent = $extrafields->showOutputField($extrafieldKey, $object->array_options[$extrafieldOptionsKey], '', $object->table_element);
 
 		// TODO : allow showOutputField to be pdf public friendly, ex: in a link to object, clean getNomUrl to remove link and images... like a getName methode ...
 		if ($extrafields->attributes[$object->table_element]['type'][$extrafieldKey] == 'link') {