diff --git a/flopy/discretization/unstructuredgrid.py b/flopy/discretization/unstructuredgrid.py
index a3ae57e0d7..fbb4d6f0b0 100644
--- a/flopy/discretization/unstructuredgrid.py
+++ b/flopy/discretization/unstructuredgrid.py
@@ -51,7 +51,7 @@ def __init__(self, vertices=None, iverts=None, xcenters=None, ycenters=None,
             else:
                 msg = ('Length of iverts must equal ncpl.sum '
                        '({} {})'.format(len(iverts), ncpl))
-                assert len(iverts) == ncpl.sum(), msg
+                assert len(iverts) == np.sum(ncpl), msg
                 assert np.array(self.xcellcenters).shape[0] == self.ncpl
                 assert np.array(self.ycellcenters).shape[0] == self.ncpl
 
diff --git a/flopy/plot/map.py b/flopy/plot/map.py
index 365b4b9e5b..dd4b4668bb 100644
--- a/flopy/plot/map.py
+++ b/flopy/plot/map.py
@@ -170,7 +170,7 @@ def plot_array(self, a, masked_values=None, **kwargs):
 
         else:
             quadmesh = plotutil.plot_cvfd(self.mg._vertices, self.mg._iverts,
-                                          a=a, ax=ax)
+                                          a=plotarray, ax=ax)
 
         # set max and min
         if 'vmin' in kwargs: