diff --git a/apps/resm/tasks.py b/apps/resm/tasks.py
index 16ea9c0..2e226d3 100644
--- a/apps/resm/tasks.py
+++ b/apps/resm/tasks.py
@@ -459,6 +459,9 @@ def save_pdf_from_openalex(paper:Paper):
         if "Insufficient credits" in res.json().get("message", ""):
             cache.set("openalex_api_exceed", True, timeout=3600)
             return "openalex_pdf_error: Insufficient credits"
+    elif res.status_code == 404:
+        paper.save_fail_reason("openalex_pdf_not_found")
+        return "openalex_pdf_error: 404"
 
 
 def save_pdf_from_elsevier(paper:Paper):