diff --git a/apps/resm/tasks.py b/apps/resm/tasks.py
index 2e226d3..67760ae 100644
--- a/apps/resm/tasks.py
+++ b/apps/resm/tasks.py
@@ -153,7 +153,7 @@ def get_pdf_from_openalex(number_of_task: int =10):
         return "stoped"
     count = 0
     qs = Paper.objects.filter(is_oa=True, has_fulltext=False).exclude(
-        fetch_status="downloading")[:number_of_task]
+        fetch_status="downloading").exclude(fail_reason__contains="openalex_pdf_not_found")[:number_of_task]
     if not qs.exists():
         return "done"
     for paper in qs:
@@ -462,6 +462,9 @@ def save_pdf_from_openalex(paper:Paper):
     elif res.status_code == 404:
         paper.save_fail_reason("openalex_pdf_not_found")
         return "openalex_pdf_error: 404"
+    else:
+        paper.save_fail_reason("openalex_pdf_error")
+        return f"openalex_pdf_error: {res.status_code} {res.text}"
 
 
 def save_pdf_from_elsevier(paper:Paper):