diff --git a/tests/obs_test.py b/tests/obs_test.py
index 0a62bab1..3f65ecee 100644
--- a/tests/obs_test.py
+++ b/tests/obs_test.py
@@ -1146,3 +1146,9 @@ def test_non_overlapping_operations_different_lengths():
 
         assert np.isclose(res1.value, res2.value)
         assert np.isclose(res1.dvalue, res2.dvalue, rtol=0.01)
+
+
+def test_nan_obs():
+    o = pe.pseudo_Obs(1, .1, 'test')
+    no = np.nan * o
+    no.gamma_method()