diff --git a/htdocs/core/class/commonobject.class.php b/htdocs/core/class/commonobject.class.php
index 90747f0675b..fb90498cf4c 100644
--- a/htdocs/core/class/commonobject.class.php
+++ b/htdocs/core/class/commonobject.class.php
@@ -4495,7 +4495,7 @@ abstract class CommonObject
 			{
 				$extrafields->fetch_name_optionals_label($this->table_element);
 			}
-			$optionsArray = (! empty($extrafields->attributes[$this->table_element]['label'])?$extrafields->attributes[$this->table_element]['label']:'');
+			$optionsArray = (! empty($extrafields->attributes[$this->table_element]['label'])?$extrafields->attributes[$this->table_element]['label']:null);
 		}
 		else
 		{