diff --git a/rag/svr/task_executor.py b/rag/svr/task_executor.py
index 23a0dc214..f5799a964 100644
--- a/rag/svr/task_executor.py
+++ b/rag/svr/task_executor.py
@@ -284,7 +284,7 @@ async def build_chunks(task, progress_callback):
         try:
             d = copy.deepcopy(document)
             d.update(chunk)
-            d["id"] = xxhash.xxh64((chunk["content_with_weight"] + str(d["doc_id"])).encode("utf-8")).hexdigest()
+            d["id"] = xxhash.xxh64((chunk["content_with_weight"] + str(d["doc_id"])).encode("utf-8", "surrogatepass")).hexdigest()
             d["create_time"] = str(datetime.now()).replace("T", " ")[:19]
             d["create_timestamp_flt"] = datetime.now().timestamp()
             if not d.get("image"):