diff --git a/app/scodoc/sco_cache.py b/app/scodoc/sco_cache.py
index b3a80f6269..f92ba7bc2c 100644
--- a/app/scodoc/sco_cache.py
+++ b/app/scodoc/sco_cache.py
@@ -251,7 +251,7 @@ def invalidate_formsemestre(  # was inval_cache(formsemestre_id=None, pdfonly=Fa
     """
     from app.scodoc import sco_parcours_dut
 
-    if g.defer_cache_invalidation:
+    if getattr(g, "defer_cache_invalidation", False):
         g.sem_to_invalidate.add(formsemestre_id)
         return
     log("inval_cache, formsemestre_id=%s pdfonly=%s" % (formsemestre_id, pdfonly))