diff --git a/app/api/search.py b/app/api/search.py
index 4def726..cfe5d7b 100644
--- a/app/api/search.py
+++ b/app/api/search.py
@@ -34,7 +34,7 @@ def search_docs(request: QueryRequest, user_id: str = Query(..., description="
         # 构建 LlamaIndex 检索器
         logger.info(f"Loading Faiss vector store from path: {index_path}")
         faiss_store = FaissVectorStore.from_persist_path(index_path)
-        service_context = ServiceContext.from_defaults(embed_model=embedder)
+        service_context = ServiceContext.from_defaults(embed_model=embedder, llm=None)
         logger.info("Service context created successfully.")
 
         index = VectorStoreIndex.from_vector_store(faiss_store, service_context=service_context)