diff --git a/api/chalicelib/core/metrics/custom_metrics.py b/api/chalicelib/core/metrics/custom_metrics.py
index 2eea08b46..2ba1ac6d7 100644
--- a/api/chalicelib/core/metrics/custom_metrics.py
+++ b/api/chalicelib/core/metrics/custom_metrics.py
@@ -448,7 +448,7 @@ def __get_global_attributes(row):
     if row is None or row.get("cardInfo") is None:
         return row
     card_info = row.get("cardInfo", {})
-    row["compareTo"] = card_info.get("compareTo", [])
+    row["compareTo"] = card_info["compareTo"] if card_info.get("compareTo") is not None else []
     return row