diff --git a/rowers/dataprep.py b/rowers/dataprep.py
index 48d0793f..489be2ac 100644
--- a/rowers/dataprep.py
+++ b/rowers/dataprep.py
@@ -750,6 +750,7 @@ def clean_df_stats(datadf, workstrokesonly=True, ignorehr=True,
     return datadf
 
 def getpartofday(row,r):
+    workoutstartdatetime = row.rowdatetime
     try:
         latavg = row.df[' latitude'].mean()
         lonavg = row.df[' longitude'].mean()
@@ -772,6 +773,7 @@ def getpartofday(row,r):
             workoutstartdatetime = row.rowdatetime
     except KeyError:
         timezone_str = r.defaulttimezone
+        workoutstartdatetime = row.rowdatetime
 
     h = workoutstartdatetime.astimezone(pytz.timezone(timezone_str)).hour