bugfix email list

app/UI/Client/DistributionList/Providers/EditListDataProvider.php

@@ -223,6 +223,7 @@ class EditListDataProvider extends AddListDataProvider
         }
         // find new external members to add
         $addExtMembers = array();
+        $customMembers = array();
         if(!empty($this->formData['customMember'])){
             $customMembers = explode(',',$this->formData['customMember']);
             foreach($customMembers as $extMember) {