diff --git a/htdocs/core/ajax/ajaxextrafield.php b/htdocs/core/ajax/ajaxextrafield.php
index 31dc393b375..317855a2bde 100644
--- a/htdocs/core/ajax/ajaxextrafield.php
+++ b/htdocs/core/ajax/ajaxextrafield.php
@@ -180,8 +180,8 @@ if ($object instanceof CommonObject) {
 		}
 
 		if (!$filter_categorie) {
-			$fields_label = explode('|', $InfoFieldList[1]);
-			if (count($fields_label) > 0) {
+			$fields_label = isset($InfoFieldList[1]) ? explode('|', $InfoFieldList[1]) : array();
+			if (!empty($fields_label)) {
 				$keyList .= ', ';
 				$keyList .= implode(', ', $fields_label);
 			}
diff --git a/htdocs/core/class/commonobject.class.php b/htdocs/core/class/commonobject.class.php
index 7b85beaaa9e..af10c4eabeb 100644
--- a/htdocs/core/class/commonobject.class.php
+++ b/htdocs/core/class/commonobject.class.php
@@ -8000,8 +8000,8 @@ abstract class CommonObject
 				}
 
 				if (!$filter_categorie) {
-					$fields_label = explode('|', $InfoFieldList[1]);
-					if (is_array($fields_label)) {
+					$fields_label = isset($InfoFieldList[1]) ? explode('|', $InfoFieldList[1]) : array();
+					if (!empty($fields_label)) {
 						$keyList .= ', ';
 						$keyList .= implode(', ', $fields_label);
 					}
diff --git a/htdocs/core/class/extrafields.class.php b/htdocs/core/class/extrafields.class.php
index 28284d1519e..911240ffa22 100644
--- a/htdocs/core/class/extrafields.class.php
+++ b/htdocs/core/class/extrafields.class.php
@@ -1539,8 +1539,8 @@ class ExtraFields
 					}
 
 					if (!$filter_categorie) {
-						$fields_label = explode('|', $InfoFieldList[1]);
-						if (is_array($fields_label)) {
+						$fields_label = isset($InfoFieldList[1]) ? explode('|', $InfoFieldList[1]) : array();
+						if (!empty($fields_label)) {
 							$keyList .= ', ';
 							$keyList .= implode(', ', $fields_label);
 						}
diff --git a/htdocs/webportal/class/html.formwebportal.class.php b/htdocs/webportal/class/html.formwebportal.class.php
index 3807dbcb5e1..8ab94ea2537 100644
--- a/htdocs/webportal/class/html.formwebportal.class.php
+++ b/htdocs/webportal/class/html.formwebportal.class.php
@@ -842,8 +842,8 @@ class FormWebPortal extends Form
 				}
 
 				if (!$filter_categorie) {
-					$fields_label = explode('|', $InfoFieldList[1]);
-					if (is_array($fields_label)) {
+					$fields_label = isset($InfoFieldList[1]) ? explode('|', $InfoFieldList[1]) : array();
+					if (!empty($fields_label)) {
 						$keyList .= ', ';
 						$keyList .= implode(', ', $fields_label);
 					}