diff --git a/htdocs/core/class/extrafields.class.php b/htdocs/core/class/extrafields.class.php
index 221925075e1..0aef926b693 100644
--- a/htdocs/core/class/extrafields.class.php
+++ b/htdocs/core/class/extrafields.class.php
@@ -51,7 +51,7 @@ class ExtraFields
 	public $attributes = array();
 
 	/**
-	 * @var array<string,bool|int<0,1>>	Array with boolean of status of groups
+	 * @var array<string,bool|int<0,1>>|null	Array with boolean of status of groups
 	 */
 	public $expand_display;
 
diff --git a/htdocs/core/tpl/extrafields_view.tpl.php b/htdocs/core/tpl/extrafields_view.tpl.php
index e0dccc9b8ab..700824e7ae3 100644
--- a/htdocs/core/tpl/extrafields_view.tpl.php
+++ b/htdocs/core/tpl/extrafields_view.tpl.php
@@ -29,6 +29,7 @@
  * @var CommonObject $object
  * @var Conf $conf
  * @var DoliDB $db
+ * @var ExtraFields $extrafields
  * @var Form $form
  * @var Translate $langs
  * @var User $user
@@ -81,7 +82,7 @@ if (empty($reshook) && !empty($object->table_element) && isset($extrafields->att
 
 		$enabled = 1;
 		if ($enabled && isset($extrafields->attributes[$object->table_element]['enabled'][$tmpkeyextra])) {
-			$enabled = (int) dol_eval($extrafields->attributes[$object->table_element]['enabled'][$tmpkeyextra], 1, 1, '2');
+			$enabled = (int) dol_eval((string) $extrafields->attributes[$object->table_element]['enabled'][$tmpkeyextra], 1, 1, '2');
 		}
 		if ($enabled && isset($extrafields->attributes[$object->table_element]['list'][$tmpkeyextra])) {
 			$enabled = (int) dol_eval($extrafields->attributes[$object->table_element]['list'][$tmpkeyextra], 1, 1, '2');