diff --git a/modules/util/util.py b/modules/util/util.py
index 2ce16c6ceeb10f78346447ac5655421f0fe342f8..d21fc755d7188de7ffe298c4f1517e9b97b1f234 100644
--- a/modules/util/util.py
+++ b/modules/util/util.py
@@ -157,7 +157,7 @@ def value_to_index(nda, value):
 def is_night(solzen, test_angle=80.0, threshold=0.10):
     solzen = solzen.flatten()
     solzen = solzen[np.invert(np.isnan(solzen))]
-    if (np.sum(solzen > test_angle) / len(solzen)) > threshold:
+    if len(solzen) == 0 or (np.sum(solzen > test_angle) / len(solzen)) > threshold:
         return True
     else:
         return False