diff --git a/mmhuman3d/core/conventions/keypoints_mapping/__init__.py b/mmhuman3d/core/conventions/keypoints_mapping/__init__.py
index ee8d1145..5e3a014c 100644
--- a/mmhuman3d/core/conventions/keypoints_mapping/__init__.py
+++ b/mmhuman3d/core/conventions/keypoints_mapping/__init__.py
@@ -382,7 +382,7 @@ def get_keypoint_idx(name: str,
                 idx = -1
             if idx >= 0:
                 return idx
-    return idx
+    raise ValueError(f'Cannot find joint: {name} in convention type: {convention}')
 
 
 def get_keypoint_num(convention: str = 'smplx',