diff --git a/nodestorage/stat.go b/nodestorage/stat.go
index ea4b165..24b1d36 100644
--- a/nodestorage/stat.go
+++ b/nodestorage/stat.go
@@ -145,6 +145,9 @@ func calculateStatsPerObject(stats *ObjectSpaceStats) {
 }
 
 func calcMedian(sortedLengths []int) (median float64) {
+	if len(sortedLengths) == 0 {
+		return 0
+	}
 	mid := len(sortedLengths) / 2
 	if len(sortedLengths)%2 == 0 {
 		median = float64(sortedLengths[mid-1]+sortedLengths[mid]) / 2.0
diff --git a/nodestorage/stat_test.go b/nodestorage/stat_test.go
new file mode 100644
index 0000000..84e05e9
--- /dev/null
+++ b/nodestorage/stat_test.go
@@ -0,0 +1,20 @@
+package nodestorage
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestCalcMedian(t *testing.T) {
+	t.Run("empty slice returns zero without panic", func(t *testing.T) {
+		assert.Equal(t, 0.0, calcMedian(nil))
+		assert.Equal(t, 0.0, calcMedian([]int{}))
+	})
+	t.Run("odd length", func(t *testing.T) {
+		assert.Equal(t, 3.0, calcMedian([]int{1, 2, 3, 4, 5}))
+	})
+	t.Run("even length", func(t *testing.T) {
+		assert.Equal(t, 2.5, calcMedian([]int{1, 2, 3, 4}))
+	})
+}