diff --git a/src/common/cache_manager.py b/src/common/cache_manager.py
index 7d9003a4a..3bafea825 100644
--- a/src/common/cache_manager.py
+++ b/src/common/cache_manager.py
@@ -134,7 +134,9 @@ class CacheManager:
         if semantic_query and self.embedding_model:
             embedding_result = await self.embedding_model.get_embedding(semantic_query)
             if embedding_result:
-                validated_embedding = self._validate_embedding(embedding_result)
+                # embedding_result是一个元组(embedding_vector, model_name)，取第一个元素
+                embedding_vector = embedding_result[0] if isinstance(embedding_result, tuple) else embedding_result
+                validated_embedding = self._validate_embedding(embedding_vector)
                 if validated_embedding is not None:
                     query_embedding = np.array([validated_embedding], dtype='float32')
 
@@ -250,12 +252,14 @@ class CacheManager:
         )
 
         # 写入语义缓存
-        if semantic_query and self.embedding_model:
-            embedding_result = await self.embedding_model.get_embedding(semantic_query)
-            if embedding_result:
-                validated_embedding = self._validate_embedding(embedding_result)
-                if validated_embedding is not None:
-                    try:
+        if semantic_query and self.embedding_model and self.chroma_collection:
+            try:
+                embedding_result = await self.embedding_model.get_embedding(semantic_query)
+                if embedding_result:
+                    # embedding_result是一个元组(embedding_vector, model_name)，取第一个元素
+                    embedding_vector = embedding_result[0] if isinstance(embedding_result, tuple) else embedding_result
+                    validated_embedding = self._validate_embedding(embedding_vector)
+                    if validated_embedding is not None:
                         embedding = np.array([validated_embedding], dtype='float32')
                         # 写入 L1 Vector
                         new_id = self.l1_vector_index.ntotal