diff --git a/superset/utils/core.py b/superset/utils/core.py
index ce55814b22a..b927742b4e9 100644
--- a/superset/utils/core.py
+++ b/superset/utils/core.py
@@ -941,7 +941,7 @@ def get_example_database():
 
 
 def is_adhoc_metric(metric) -> bool:
-    return (
+    return bool(
         isinstance(metric, dict)
         and (
             (