diff --git a/x2paddle/op_mapper/onnx2paddle/opset9/opset.py b/x2paddle/op_mapper/onnx2paddle/opset9/opset.py
index e7c2b8572d1a765dc1c194ff26714df1e82f4646..3dec5b5e809dd9509132ef2250e0427d603f745d 100755
--- a/x2paddle/op_mapper/onnx2paddle/opset9/opset.py
+++ b/x2paddle/op_mapper/onnx2paddle/opset9/opset.py
@@ -61,7 +61,7 @@ def _rename_or_remove_weight(weights,
     Returns:
         None
     '''
-    if origin_name in rename_mapper:
+    if rename_mapper is not None and origin_name in rename_mapper:
         origin_name = rename_mapper[origin_name]
         is_remove = False
     if origin_name not in weights: