diff --git a/python/damask/_orientation.py b/python/damask/_orientation.py
index 8a560e756..dff380dcf 100644
--- a/python/damask/_orientation.py
+++ b/python/damask/_orientation.py
@@ -148,7 +148,7 @@ class Orientation(Rotation,Crystal):
 
         """
         if not isinstance(other, Orientation):
-            raise NotImplemented
+            return NotImplemented
         matching_type = self.family == other.family and \
                         self.lattice == other.lattice and \
                         self.parameters == other.parameters
diff --git a/python/damask/_rotation.py b/python/damask/_rotation.py
index a04b20e62..361dba7c1 100644
--- a/python/damask/_rotation.py
+++ b/python/damask/_rotation.py
@@ -997,7 +997,7 @@ class Rotation:
                  N: int = 500,
                  degrees: bool = True,
                  fractions: bool = True,
-                 rng_seed: Union[None, int, IntSequence] = None) -> 'Rotation':
+                 rng_seed: Union[int, IntSequence] = None) -> 'Rotation':
         """
         Sample discrete values from a binned orientation distribution function (ODF).
 
@@ -1054,7 +1054,7 @@ class Rotation:
                                  sigma: float,
                                  N: int = 500,
                                  degrees: bool = True,
-                                 rng_seed: Union[None, int, IntSequence] = None) -> 'Rotation':
+                                 rng_seed: Union[int, IntSequence] = None) -> 'Rotation':
         """
         Calculate set of rotations with Gaussian distribution around center.