WebSVN – Moodle – Diff – /mod/bigbluebuttonbn/classes/local/helpers/roles.php

      * @param context|null $context $context
      * @param bool $onlyviewableroles
+     *
      * @return array $users
      */
-    protected static function get_roles_select(context $context = null, bool $onlyviewableroles = true) {
+    protected static function get_roles_select(?context $context = null, bool $onlyviewableroles = true) {
         global $CFG;
         if ($onlyviewableroles == true && $CFG->branch >= 35) {
             $roles = (array) get_viewable_roles($context);
             'name' => get_string('mod_form_field_participant_list_type_role', 'bigbluebuttonbn'),
             'children' => self::get_roles_select($context, true)
         ];
         $data['user'] = [
             'name' => get_string('mod_form_field_participant_list_type_user', 'bigbluebuttonbn'),
-            'children' => self::get_users_array($context, $bbactivity),
+            'children' => [],
         ];
+        if (empty($bbactivity)) {
+            return $data;
+        }
+        $data['user']['children'] = self::get_users_array($context, $bbactivity);
         return $data;
+    }
     /**

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