diff --git a/supervision/detection/core.py b/supervision/detection/core.py
index 0ba9e4f4..6563de7d 100644
--- a/supervision/detection/core.py
+++ b/supervision/detection/core.py
@@ -240,7 +240,7 @@ class Detections:
             Class names values can be accessed using `detections["class_name"]`.
         """  # noqa: E501 // docs
 
-        if "obb" in ultralytics_results and ultralytics_results.obb is not None:
+        if hasattr(ultralytics_results, "obb") and ultralytics_results.obb is not None:
             class_id = ultralytics_results.obb.cls.cpu().numpy().astype(int)
             class_names = np.array([ultralytics_results.names[i] for i in class_id])
             oriented_box_coordinates = ultralytics_results.obb.xyxyxyxy.cpu().numpy()