diff --git a/apps/resm/tasks.py b/apps/resm/tasks.py
index 59a1dba..f4219fe 100644
--- a/apps/resm/tasks.py
+++ b/apps/resm/tasks.py
@@ -112,7 +112,7 @@ def get_paper_meta_from_openalex(publication_year:int, keywords:str="", search:s
                 papers.append(paper)
         Paper.objects.bulk_create(papers, ignore_conflicts=True)
     cache.set(cache_key, next_cursor, timeout=None)
-    if cache.get("get_paper_meta_from_openalex_stop") is not None:
+    if cache.get("get_paper_meta_from_openalex_stop", None) is None:
         if end_year is None:
             end_year = datetime.now().year
         if publication_year + 1 <= end_year: