Update app.py

app.py

@@ -577,7 +577,10 @@ def compare_face(frame1, frame2):
         faces = [face1, face2]
 
         face_bboxes_result = []
-        if face_bboxes is not None:
+        if face_bboxes is None:
+            gr.Warning(result)
+            return None, None, None, None
+        else:
             for i, bbox in enumerate(face_bboxes):
                 x1 = bbox[0]
                 y1 = bbox[1]