diff --git a/masque/repetition.py b/masque/repetition.py
index d7b6ac2..e1507b8 100644
--- a/masque/repetition.py
+++ b/masque/repetition.py
@@ -298,10 +298,6 @@ class Grid(Repetition):
             return self.b_count < other.b_count
         if not numpy.array_equal(self.a_vector, other.a_vector):
             return tuple(self.a_vector) < tuple(other.a_vector)
-        if self.b_vector is None:
-            return other.b_vector is not None
-        if other.b_vector is None:
-            return False
         if not numpy.array_equal(self.b_vector, other.b_vector):
             return tuple(self.b_vector) < tuple(other.b_vector)
         return False