tested

rowers/interactiveplots.py

@@ -1721,9 +1721,10 @@ def interactive_flexchart_stacked(id, r, xparam='time',
                 if metricsdicts[column]['maysmooth']:
                     nrsteps = int(log2(r.usersmooth))
                     for i in range(nrsteps):
+                        column_ew = utils.ewmovingaverage(
+                            rowdata[column], 5)
                         rowdata = rowdata.with_columns(
-                          utils.ewmovingaverage(
+                            column = column_ew
-                            rowdata[column], 5).alias(column)  
                         ) 
             except KeyError:
                 pass

rowers/models.py

@@ -3702,7 +3702,7 @@ class Workout(models.Model):
         except AttributeError:
             dates = ''
         try:
-            durations = self.duration.strftime("%H:%M:%S"),
+            durations = self.duration.strftime("%H:%M:%S")
         except AttributeError:
             durations = ''