diff --git a/backend/app/activities/activity_streams/crud.py b/backend/app/activities/activity_streams/crud.py
index fb468bc5c..20597eda3 100644
--- a/backend/app/activities/activity_streams/crud.py
+++ b/backend/app/activities/activity_streams/crud.py
@@ -369,7 +369,7 @@ def transform_activity_streams_hr(activity_stream, activity, db):
         activity: The activity object associated with the stream, used to retrieve the user ID.
         db: The database session or connection used to fetch user details.
     Returns:
-        The activity stream object with an added 'hr_zone_percentages' attribute, which contains the percentage of time spent in each heart rate zone and their respective HR boundaries. If waypoints or user details are missing, returns the original activity stream unchanged.
+        The activity stream object with an added 'hr_zone_percentages' attribute, which contains the percentage of time spent in each heart rate zone and their respective HR boundaries. If waypoi[...]
     Notes:
         - Heart rate zones are calculated using the formula: max_heart_rate = 220 - age.
         - The function expects waypoints to be a list of dicts with an "hr" key.
@@ -429,7 +429,11 @@ def transform_activity_streams_hr(activity_stream, activity, db):
 
     # Calculate time in seconds for each zone using the percentage
     # of total_timer_time
-    if hasattr(activity, "total_timer_time") and activity.total_timer_time:
+    has_timer_time = (
+        hasattr(activity, "total_timer_time")
+        and activity.total_timer_time
+    )
+    if has_timer_time:
         total_time_seconds = activity.total_timer_time
         zone_time_seconds = [
             int((percent / 100) * total_time_seconds)