diff --git a/lib/matplotlib/projections/geo.py b/lib/matplotlib/projections/geo.py
index a81dad29782c..b32dace89709 100644
--- a/lib/matplotlib/projections/geo.py
+++ b/lib/matplotlib/projections/geo.py
@@ -484,11 +484,12 @@ def transform_non_affine(self, xy):
             x = xy[:, 0:1]
             y = xy[:, 1:2]
 
-            # from Equations (7, 8) of
-            # http://mathworld.wolfram.com/MollweideProjection.html
-            theta = np.arcsin(y / np.sqrt(2))
-            lon = (np.pi / (2 * np.sqrt(2))) * x / np.cos(theta)
-            lat = np.arcsin((2 * theta + np.sin(2 * theta)) / np.pi)
+            with np.errstate(invalid='ignore'):
+                # from Equations (7, 8) of
+                # http://mathworld.wolfram.com/MollweideProjection.html
+                theta = np.arcsin(y / np.sqrt(2))
+                lon = (np.pi / (2 * np.sqrt(2))) * x / np.cos(theta)
+                lat = np.arcsin((2 * theta + np.sin(2 * theta)) / np.pi)
 
             return np.concatenate((lon, lat), 1)
         transform_non_affine.__doc__ = Transform.transform_non_affine.__doc__