diff --git a/openmc/material.py b/openmc/material.py
index 375e1dca1e..1700055268 100644
--- a/openmc/material.py
+++ b/openmc/material.py
@@ -413,6 +413,8 @@ class Material(IDManagerMixin):
             Z, _, _ = openmc.data.zam(nuclide)
         except ValueError as e:
             warnings.warn(str(e))
+        except KeyError as e:
+            warnings.warn(repr(e))
         else:
             # For actinides, have the material be depletable by default
             if Z >= 89:
diff --git a/tests/unit_tests/test_pin.py b/tests/unit_tests/test_pin.py
index 42241de5f2..c2a5bc9c0e 100644
--- a/tests/unit_tests/test_pin.py
+++ b/tests/unit_tests/test_pin.py
@@ -2,7 +2,7 @@
 Tests for constructing Pin universes
 """
 
-import numpy
+import numpy as np
 import pytest
 
 import openmc
@@ -98,8 +98,8 @@ def test_subdivide(pin_mats, good_radii, surf_type):
     # check volumes of new rings
     radii = get_pin_radii(div0)
     bounds = [0] + radii[:N]
-    sqrs = numpy.square(bounds)
-    assert sqrs[1:] - sqrs[:-1] == pytest.approx(good_radii[0] ** 2 / N)
+    sqrs = np.square(bounds)
+    assert np.all(sqrs[1:] - sqrs[:-1] == pytest.approx(good_radii[0] ** 2 / N))
 
     # subdivide non-inner most region
     new_pin = pin(surfs, pin_mats, {1: N})
@@ -112,6 +112,6 @@ def test_subdivide(pin_mats, good_radii, surf_type):
 
     # check volumes of new rings
     radii = get_pin_radii(new_pin)
-    sqrs = numpy.square(radii[:N + 1])
-    assert sqrs[1:] - sqrs[:-1] == pytest.approx(
-        (good_radii[1] ** 2 - good_radii[0] ** 2) / N)
+    sqrs = np.square(radii[:N + 1])
+    assert np.all(sqrs[1:] - sqrs[:-1] == pytest.approx(
+        (good_radii[1] ** 2 - good_radii[0] ** 2) / N))