diff --git a/rag/nlp/search.py b/rag/nlp/search.py
index 48f3d7a43..b463aa9a5 100644
--- a/rag/nlp/search.py
+++ b/rag/nlp/search.py
@@ -15,6 +15,7 @@
 #
 import logging
 import re
+import json
 from dataclasses import dataclass
 
 from rag.settings import TAG_FLD, PAGERANK_FLD
@@ -258,7 +259,7 @@ class Dealer:
         q_denor = np.sqrt(np.sum([s*s for t,s in query_rfea.items() if t != PAGERANK_FLD]))
         for i in search_res.ids:
             nor, denor = 0, 0
-            for t, sc in eval(search_res.field[i].get(TAG_FLD, "{}")).items():
+            for t, sc in json.loads(search_res.field[i].get(TAG_FLD, "{}")).items():
                 if t in query_rfea:
                     nor += query_rfea[t] * sc
                 denor += sc * sc