diff --git a/test/detection/test_vlm.py b/test/detection/test_vlm.py
index 7bfc2313..9a0195f7 100644
--- a/test/detection/test_vlm.py
+++ b/test/detection/test_vlm.py
@@ -357,6 +357,18 @@ def test_from_paligemma(
                 np.array(["dog", "cat"], dtype=str),
             ),
         ),  # truncated response, last object unfinished, previous ones recovered
+        (
+            pytest.raises(ValueError),
+            """```json
+            [
+                {"bbox_2d": [10, 20, 110, 120], "label": "cat"}
+            ]
+            ```""",
+            (0, 640),
+            (1280, 720),
+            None,
+            None,  # invalid input_wh
+        ),
         (
             pytest.raises(ValueError),
             """```json