     group = App.Group.find(groupId)
     users = []
 
-    users.push App.User.find(i) for i in group.user_ids
+    for user_id in group.user_ids
+      if App.User.exists(user_id)
+        users.push App.User.find(user_id)
 
     @batchAssignGroupName.text group.displayName()
     @batchAssignGroupInner.html $(App.view('ticket_overview/batch_overlay_user_group')(


  endDragItem: (event) =>
    return if !@batchSupport
    $(document).off 'mousemove.item'
    $(document).off 'mouseup.item'
    pos = @batchDragger.data()


    $(document).on 'mousemove.item', @dragItem
    $(document).one 'mouseup.item', @endDragItem

    @mainContent.addClass('u-unclickable')
    # TODO: fire @cancelDrag on ESC

  dragItem: (event) =>
