diff --git a/lib/galaxy/visualization/tracks/summary.py b/lib/galaxy/visualization/tracks/summary.py
index 1bec8882671..ba2b26ac121 100644
--- a/lib/galaxy/visualization/tracks/summary.py
+++ b/lib/galaxy/visualization/tracks/summary.py
@@ -93,8 +93,10 @@ class SummaryTree:
             starting_block = self.find_block( start, level )
             ending_block = self.find_block( end, level )
             for block in range( starting_block, ending_block + 1 ):
+                val = 0
                 if block in blocks[ level ]:
-                    results.append(  ( block * multiplier, blocks[ level ][ block ] )  )
+                    val = blocks[ level ][ block ]
+                results.append(  ( block * multiplier, val )  )
             return results
             
         return None
diff --git a/lib/galaxy/web/controllers/tracks.py b/lib/galaxy/web/controllers/tracks.py
index c1d500025ed..3291516dc6e 100644
--- a/lib/galaxy/web/controllers/tracks.py
+++ b/lib/galaxy/web/controllers/tracks.py
@@ -559,7 +559,7 @@ class TracksController( BaseUIController, UsesVisualizationMixin, UsesHistoryDat
             converted_dataset = dataset.get_converted_dataset( trans, indexed_type )
             data_provider = get_data_provider( indexed_type )( converted_dataset, dataset )
             # HACK: pass in additional params, which are only used for summary tree data, not BBI data.
-            track[ 'genome_wide_data' ] = { 'data': data_provider.get_genome_data( chroms_info, level=3, detail_cutoff=0, draw_cutoff=0 ) }
+            track[ 'genome_wide_data' ] = { 'data': data_provider.get_genome_data( chroms_info, level=4, detail_cutoff=0, draw_cutoff=0 ) }
         
         return trans.fill_template( 'visualization/circster.mako', viz_config=viz_config, genome=genome )