diff --git a/rag/llm/rerank_model.py b/rag/llm/rerank_model.py
index 1ea2faed..89cf1267 100644
--- a/rag/llm/rerank_model.py
+++ b/rag/llm/rerank_model.py
@@ -15,6 +15,7 @@
 #
 import re
 import threading
+from collections.abc import Iterable
 from urllib.parse import urljoin
 
 import requests
@@ -135,6 +136,8 @@ class DefaultRerank(Base):
         else:
             scores = self._model.compute_score(batch_pairs, max_length=max_length)
         scores = sigmoid(np.array(scores)).tolist()
+        if not isinstance(scores, Iterable):
+            scores = [scores]
         return scores
 
     def similarity(self, query: str, texts: list):