diff --git a/htdocs/knowledgemanagement/knowledgerecord_list.php b/htdocs/knowledgemanagement/knowledgerecord_list.php
index 0e8f3a12514..8ec8ae62e2f 100644
--- a/htdocs/knowledgemanagement/knowledgerecord_list.php
+++ b/htdocs/knowledgemanagement/knowledgerecord_list.php
@@ -226,7 +226,7 @@ if (!empty($extrafields->attributes[$object->table_element]['label'])) {
 // Add fields from hooks
 $parameters = array();
 $reshook = $hookmanager->executeHooks('printFieldListSelect', $parameters, $object); // Note that $action and $object may have been modified by hook
-$sql .= preg_replace('/^,/', '', $hookmanager->resPrint);
+$sql .= preg_replace('/^,/', ',', $hookmanager->resPrint);
 $sql = preg_replace('/,\s*$/', '', $sql);
 $sql .= " FROM ".MAIN_DB_PREFIX.$object->table_element." as t";
 if (is_array($extrafields->attributes[$object->table_element]['label']) && count($extrafields->attributes[$object->table_element]['label'])) {