diff --git a/modoboa/pdfcredentials/lib.py b/modoboa/pdfcredentials/lib.py
index 937dd6731..a7bd85a4d 100644
--- a/modoboa/pdfcredentials/lib.py
+++ b/modoboa/pdfcredentials/lib.py
@@ -96,9 +96,7 @@ def get_document_logo():
         logo = settings.MODOBOA_CUSTOM_LOGO
         logo = os.path.join(settings.MEDIA_ROOT, os.path.basename(logo))
     except AttributeError:
-        try:
-            logo = os.path.join(settings.STATIC_ROOT, "css/modoboa.png")
-        except OSError:
-            return None
-    finally:
-        return logo
+        logo = os.path.join(settings.STATIC_ROOT, "css/modoboa.png")
+    if not os.path.isfile(logo):
+        return None
+    return logo