diff --git a/api/chalicelib/utils/metrics_helper.py b/api/chalicelib/utils/metrics_helper.py
index 7bf9c94f8..1353398fe 100644
--- a/api/chalicelib/utils/metrics_helper.py
+++ b/api/chalicelib/utils/metrics_helper.py
@@ -2,6 +2,8 @@ from typing import List
 
 
 def get_step_size(startTimestamp, endTimestamp, density, decimal=False, factor=1000):
+    if endTimestamp == 0:
+        raise Exception("endTimestamp cannot be 0 in order to get step size")
     step_size = (endTimestamp // factor - startTimestamp // factor)
     if density <= 1:
         return step_size