diff --git a/api/apps/sdk/dify_retrieval.py b/api/apps/sdk/dify_retrieval.py
index d2c3485a9..e02875820 100644
--- a/api/apps/sdk/dify_retrieval.py
+++ b/api/apps/sdk/dify_retrieval.py
@@ -131,12 +131,10 @@ def retrieval(tenant_id):
             return build_error_result(message="Knowledgebase not found!", code=RetCode.NOT_FOUND)
 
         embd_mdl = LLMBundle(kb.tenant_id, LLMType.EMBEDDING.value, llm_name=kb.embd_id)
-        print(metadata_condition)
-        # print("after", convert_conditions(metadata_condition))
-        doc_ids.extend(meta_filter(metas, convert_conditions(metadata_condition)))
-        # print("doc_ids", doc_ids)
-        if not doc_ids and metadata_condition is not None:
-            doc_ids = ['-999']
+        if metadata_condition:
+            doc_ids.extend(meta_filter(metas, convert_conditions(metadata_condition)))
+        if not doc_ids and metadata_condition:
+            doc_ids = ["-999"]
         ranks = settings.retriever.retrieval(
             question,
             embd_mdl,