@@ -431,8 +431,6 @@ class VectorizedSystem(System, metaclass=abc.ABCMeta):

     def site_ranges(self):

         site_offsets = np.cumsum([0] + [len(arr) for arr in self.site_arrays])

         norbs = [arr.family.norbs for arr in self.site_arrays] + [0]

-        if any(norb is None for norb in norbs):

-            return None

         orb_offsets = np.cumsum(

             [0] + [len(arr) * arr.family.norbs for arr in self.site_arrays]

         )