edit mailinglists

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

@@ -194,7 +194,7 @@ class EditListDataProvider extends AddListDataProvider
         ];
 
         $this->data['customMember'] = implode(',',$extMembers);
-        $this->data['memberList'] = $intMembers;
+        $this->data['memberList'] = implode(',',$intMembers);
         foreach($availableMembers as $availableMember) {
             $this->availableValues['memberList'][$availableMember] = $availableMember;
         }