diff --git a/pdb-plotting/src/main/java/org/lucares/pdb/plot/api/BarChartAggregatorForIntervals.java b/pdb-plotting/src/main/java/org/lucares/pdb/plot/api/BarChartAggregatorForIntervals.java
index e3cd661..8e14f69 100644
--- a/pdb-plotting/src/main/java/org/lucares/pdb/plot/api/BarChartAggregatorForIntervals.java
+++ b/pdb-plotting/src/main/java/org/lucares/pdb/plot/api/BarChartAggregatorForIntervals.java
@@ -134,13 +134,15 @@ public class BarChartAggregatorForIntervals implements CustomAggregator, Indexed
         int offset = 0;
         for (final String bucketId : bucketIds()) {
             final long count = buckets.get(bucketId).get();
-            final String label = String.format(Locale.US, "set label at %s %f, %d '%s' center front offset 0,0.3\n", // front
-                    xAxis == GnuplotAxis.X1 ? "first" : "second", //
-                    offset + getIndex() * SPACE_BETWEEN_BARS + 0.5, // x-axis position of the label
-                    count, // y axis position of the label
-                    String.format(Locale.US, "%,d", count));
+            if (count > 0) {
+                final String label = String.format(Locale.US, "set label at %s %f, %d '%s' center front offset 0,0.3\n", // front
+                        xAxis == GnuplotAxis.X1 ? "first" : "second", //
+                        offset + getIndex() * SPACE_BETWEEN_BARS + 0.5, // x-axis position of the label
+                        count, // y axis position of the label
+                        String.format(Locale.US, "%,d", count));
 
-            result.append(label);
+                result.append(label);
+            }
             offset += numberOfDataSeries;
 
         }