diff --git a/rag/svr/task_executor.py b/rag/svr/task_executor.py
index cf4028f1b..14ce6fc53 100644
--- a/rag/svr/task_executor.py
+++ b/rag/svr/task_executor.py
@@ -368,7 +368,7 @@ async def build_chunks(task, progress_callback):
 
         docs_to_tag = []
         for d in docs:
-            if settings.retrievaler.tag_content(tenant_id, kb_ids, d, all_tags, topn_tags=topn_tags, S=S):
+            if settings.retrievaler.tag_content(tenant_id, kb_ids, d, all_tags, topn_tags=topn_tags, S=S) and len(d[TAG_FLD]) > 0:
                 examples.append({"content": d["content_with_weight"], TAG_FLD: d[TAG_FLD]})
             else:
                 docs_to_tag.append(d)