         Cube.setBucketByAddress3(bucket_x, bucket_y, bucket_z, zoomStep, null)
 
     ).always =>
-      pullLoadingCount--
+      @pullLoadingCount--
       @pull()
 
   loadBucketSocket : _.once ->

    queue.length = 0

  pull : ->
    { queue, pullLoadingCount, PULL_DOWNLOAD_LIMIT } = @

    while pullLoadingCount < PULL_DOWNLOAD_LIMIT and queue.length

      [x, y, z, zoomStep] = @removeFirst()

      unless Cube.isBucketSetByAddress3(x, y, z, zoomStep)


  pullBucket : (bucket_x, bucket_y, bucket_z, zoomStep) ->

    @pullLoadingCount++
    console.log "requesting: ", [bucket_x, bucket_y, bucket_z]
    Cube.setBucketByAddress3(bucket_x, bucket_y, bucket_z, zoomStep, Cube.LOADING_PLACEHOLDER_OBJECT)

    @loadBucketByAddress3(bucket_x, bucket_y, bucket_z, zoomStep).then(

