diff --git a/lightrag/api/lightrag_server.py b/lightrag/api/lightrag_server.py
index 4a58abe2..5fff5851 100644
--- a/lightrag/api/lightrag_server.py
+++ b/lightrag/api/lightrag_server.py
@@ -672,10 +672,11 @@ def get_api_key_dependency(api_key: Optional[str]):
 # Global configuration
 global_top_k = 60  # default value
 
+
 def create_app(args):
     global global_top_k
     global_top_k = args.top_k  # save top_k from args
-    
+
     # Verify that bindings are correctly setup
     if args.llm_binding not in [
         "lollms",
diff --git a/lightrag/utils.py b/lightrag/utils.py
index f3b62d39..9df325ca 100644
--- a/lightrag/utils.py
+++ b/lightrag/utils.py
@@ -416,7 +416,13 @@ async def get_best_cached_response(
 
     if best_similarity > similarity_threshold:
         # If LLM check is enabled and all required parameters are provided
-        if use_llm_check and llm_func and original_prompt and best_prompt and best_response is not None:
+        if (
+            use_llm_check
+            and llm_func
+            and original_prompt
+            and best_prompt
+            and best_response is not None
+        ):
             compare_prompt = PROMPTS["similarity_check"].format(
                 original_prompt=original_prompt, cached_prompt=best_prompt
             )