diff --git a/test/dataset/test_utils.py b/test/dataset/test_utils.py
index 589a8f38..70105d16 100644
--- a/test/dataset/test_utils.py
+++ b/test/dataset/test_utils.py
@@ -204,6 +204,12 @@ def test_build_class_index_mapping(
             mock_detections(xyxy=[[0, 0, 10, 10]], class_id=[1]),
             DoesNotRaise()
         ),  # single mapping
+        (
+                {0: 1, 1: 2},
+                Detections.empty(),
+                Detections.empty(),
+                DoesNotRaise()
+        ),  # empty detections
         (
             {0: 1, 1: 2},
             mock_detections(xyxy=[[0, 0, 10, 10]], class_id=[0]),