diff --git a/api/db/services/task_service.py b/api/db/services/task_service.py
index 1fdfed350..401489a69 100644
--- a/api/db/services/task_service.py
+++ b/api/db/services/task_service.py
@@ -338,9 +338,9 @@ def queue_tasks(doc: dict, bucket: str, name: str, priority: int):
         file_bin = STORAGE_IMPL.get(bucket, name)
         do_layout = doc["parser_config"].get("layout_recognize", "DeepDOC")
         pages = PdfParser.total_page_number(doc["name"], file_bin)
-        page_size = doc["parser_config"].get("task_page_size", 12)
+        page_size = doc["parser_config"].get("task_page_size") or 12
         if doc["parser_id"] == "paper":
-            page_size = doc["parser_config"].get("task_page_size", 22)
+            page_size = doc["parser_config"].get("task_page_size") or 22
         if doc["parser_id"] in ["one", "knowledge_graph"] or do_layout != "DeepDOC":
             page_size = 10 ** 9
         page_ranges = doc["parser_config"].get("pages") or [(1, 10 ** 5)]