diff --git a/src/flask/app.py b/src/flask/app.py
index cacb40a5..f6656458 100644
--- a/src/flask/app.py
+++ b/src/flask/app.py
@@ -1276,7 +1276,7 @@ class Flask(Scaffold):
         """
         exc_class, code = self._get_exc_class_and_code(type(e))
 
-        for c in [code, None]:
+        for c in [code, None] if code is not None else [None]:
             for name in chain(request.blueprints, [None]):
                 handler_map = self.error_handler_spec[name][c]