diff --git a/__pycache__/compose.cpython-37.pyc b/__pycache__/compose.cpython-37.pyc
new file mode 100644
index 0000000..aa12b59
Binary files /dev/null and b/__pycache__/compose.cpython-37.pyc differ
diff --git a/compose.py b/compose.py
index 28e467a..c9418f2 100644
--- a/compose.py
+++ b/compose.py
@@ -4,7 +4,9 @@ class Composition:
         self.g = g
 
     def __call__(self, *args, **kwargs):
-       return self.f(self.g(*args, **kwargs))
+        if self.g is None:
+            return self.f(*args, **kwargs)
+        return self.f(self.g(*args, **kwargs))
 
     @property
     def __name__(self):