diff --git a/tools/infer/predict_det.py b/tools/infer/predict_det.py
index 59bb49f90abb198933b91f222febad7a416018e8..11e78a566582d5bbfadef611dbdd401ff2041bc7 100755
--- a/tools/infer/predict_det.py
+++ b/tools/infer/predict_det.py
@@ -65,7 +65,9 @@ class TextDetector(object):
             postprocess_params["max_candidates"] = 1000
             postprocess_params["unclip_ratio"] = args.det_db_unclip_ratio
             postprocess_params["use_dilation"] = args.use_dilation
-            postprocess_params["score_mode"] = args.det_db_score_mode
+            if hasattr(args, "det_db_score_mode"):
+                postprocess_params["score_mode"] = args.det_db_score_mode
+
         elif self.det_algorithm == "EAST":
             postprocess_params['name'] = 'EASTPostProcess'
             postprocess_params["score_thresh"] = args.det_east_score_thresh