diff --git a/converters/sphinx_transformer.py b/converters/sphinx_transformer.py
index 39e42c1..82c17d1 100644
--- a/converters/sphinx_transformer.py
+++ b/converters/sphinx_transformer.py
@@ -75,6 +75,8 @@ class SphinxTransformer(ActivatableTransformer):
         """
         if self.enabled:
             return self.transform(nb, other)
+        else:
+            return nb,other
 
     def transform(self, nb, other):
         """