diff --git a/rowers/dataprep.py b/rowers/dataprep.py
index 1cd31583..14a90fb2 100644
--- a/rowers/dataprep.py
+++ b/rowers/dataprep.py
@@ -483,6 +483,9 @@ def df_resample(datadf):
 def clean_df_stats(datadf, workstrokesonly=True, ignorehr=True,
                    ignoreadvanced=False):
     # clean data remove zeros and negative values
+    before = len(datadf)
+
+    data_orig = datadf.copy()
 
     # bring metrics which have negative values to positive domain
     if len(datadf)==0:
@@ -706,6 +709,12 @@ def clean_df_stats(datadf, workstrokesonly=True, ignorehr=True,
         except:
             pass
 
+    after = len(datadf.dropna())
+    ratio = float(after)/float(before)
+
+    if ratio < 0.001 or after < 2:
+        return data_orig
+
     return datadf
 
 def getstatsfields():
@@ -1444,6 +1453,7 @@ def parsenonpainsled(fileformat,f2,summary):
             pass
         hasrecognized = True
 
+
     return row,hasrecognized,summary,fileformat
 
 def handle_nonpainsled(f2, fileformat, summary=''):
@@ -1465,6 +1475,7 @@ def handle_nonpainsled(f2, fileformat, summary=''):
     # should delete file
     f2 = f2[:-4] + 'o.csv'
     row2 = rrdata(df = row.df)
+
     if 'speedcoach2' in fileformat:
         # impeller consistency
         impellerdata, consistent, ratio = row.impellerconsistent(threshold=0.3)
@@ -1472,6 +1483,7 @@ def handle_nonpainsled(f2, fileformat, summary=''):
             impeller = True
         if impellerdata and not consistent:
             row2.use_gpsdata()
+
     row2.write_csv(f2, gzip=True)
 
 
diff --git a/rowers/interactiveplots.py b/rowers/interactiveplots.py
index 5dcc988f..cf25d769 100644
--- a/rowers/interactiveplots.py
+++ b/rowers/interactiveplots.py
@@ -3715,6 +3715,7 @@ def interactive_flex_chart2(id=0,promember=0,
     rowdata = dataprep.getsmallrowdata_db(columns,ids=[id],doclean=True,
                                           workstrokesonly=workstrokesonly)
 
+
     if len(rowdata)<2:
         rowdata = dataprep.getsmallrowdata_db(columns,ids=[id],doclean=True,
                                               workstrokesonly=False)
diff --git a/rowers/tests/test_units.py b/rowers/tests/test_units.py
index 95f76243..77827338 100644
--- a/rowers/tests/test_units.py
+++ b/rowers/tests/test_units.py
@@ -85,7 +85,7 @@ class ForceUnits(TestCase):
 
         df = dataprep.clean_df_stats(df,ignoreadvanced=False)
         average_N = int(df['averageforce'].mean())
-        self.assertEqual(average_N,399)
+        self.assertEqual(average_N,398)
 
     def test_upload_speedcoach_N(self):
         login = self.c.login(username=self.u.username, password=self.password)
diff --git a/rowers/views/analysisviews.py b/rowers/views/analysisviews.py
index d8727522..bc6e5e60 100644
--- a/rowers/views/analysisviews.py
+++ b/rowers/views/analysisviews.py
@@ -318,6 +318,7 @@ def trendflexdata(workouts, options,userid=0):
     datadf['date'].replace(datemapping,inplace=True)
 
     today = datetime.date.today()
+
     datadf['days ago'] = list(map(lambda x : x.days, datadf.date - today))
 
 
@@ -648,6 +649,8 @@ def boxplotdata(workouts,options):
 
     datadf['workoutid'].replace(datemapping,inplace=True)
     datadf.rename(columns={"workoutid":"date"},inplace=True)
+    datadf['date'] = pd.to_datetime(datadf['date'],errors='coerce')
+    datadf = datadf.dropna(subset=['date'])
     datadf = datadf.sort_values(['date'])
 
     if userid == 0:
diff --git a/rowers/views/exportviews.py b/rowers/views/exportviews.py
index 286673c6..dc83f46e 100644
--- a/rowers/views/exportviews.py
+++ b/rowers/views/exportviews.py
@@ -235,8 +235,6 @@ def workout_csvemail_view(request,id=0):
 
     w = get_workout(id)
 
-
-
     rowdata = rdata(w.csvfilename)
     code = str(uuid4())
     filename = code+'.csv'
@@ -244,6 +242,7 @@ def workout_csvemail_view(request,id=0):
     rowdate = rowdata.rowdatetime
     starttimeunix = arrow.get(rowdate).timestamp
     df = rowdata.df
+
     try:
         df[' ElapsedTime (sec)'] = df['TimeStamp (sec)']
         df['TimeStamp (sec)'] = df['TimeStamp (sec)'] + starttimeunix