diff --git a/rag/nlp/search.py b/rag/nlp/search.py
index 3fef12c9d..9b0e1d5cd 100644
--- a/rag/nlp/search.py
+++ b/rag/nlp/search.py
@@ -313,7 +313,7 @@ class Dealer:
         ranks["total"] = sres.total
 
         if page <= RERANK_PAGE_LIMIT:
-            if rerank_mdl:
+            if rerank_mdl and sres.total > 0:
                 sim, tsim, vsim = self.rerank_by_model(rerank_mdl,
                     sres, question, 1 - vector_similarity_weight, vector_similarity_weight)
             else: