             @render()
 
         render_progress: =>
+            if not @datacenter?
+                return ''
             progress_data = DataUtils.get_backfill_progress_agg @model.get('id'), @datacenter.get('id')
 
             if progress_data? and _.isNaN(progress_data.percentage) is false

                @.$('.progress_bar_full_container').slideUp 'fast'

        render: =>
            replicas_count = DataUtils.get_replica_affinities(@model.get('id'), @datacenter.get('id'))
            if @model.get('primary_uuid') is @datacenter.get('id')
                replicas_count++



        destroy: =>
            if @datacenter?
                @datacenter.off 'all', @render

            @model.off 'change:primary_uuid', @render
            progress_list.off 'all', @render_progress
