diff --git a/rowers/alerts.py b/rowers/alerts.py
index 86a1716f..ef74ddf0 100644
--- a/rowers/alerts.py
+++ b/rowers/alerts.py
@@ -3,7 +3,7 @@ from rowers.teams import coach_getcoachees
 from rowers.dataprep import getsmallrowdata_db, getrowdata_db
 import datetime
 import numpy as np
-
+import math
 
 def create_alert(manager, rower, measured, period=7, emailalert=True,
                  reststrokes=False, workouttype='water', boattype='1x',
@@ -195,7 +195,7 @@ def alert_get_stats(alert, nperiod=0):  # pragma: no cover
     median = df[alert.measured.metric].median()
     std = df[alert.measured.metric].std()
 
-    return {
+    data = {
         'workouts': workouts.count(),
         'startdate': startdate,
         'enddate': enddate,
@@ -208,6 +208,18 @@ def alert_get_stats(alert, nperiod=0):  # pragma: no cover
         'standard_dev': std,
     }
 
+    data_clean = {}
+
+    for k in data:
+        data_clean[k] = data[k]
+        try:
+            if math.isnan(data[k]):
+                data_clean[k] = 0
+        except TypeError:
+            pass
+
+    return data_clean
+
 # run alert report
 
 # check alert permission
diff --git a/rowers/tasks.py b/rowers/tasks.py
index b6236ac4..521e0467 100644
--- a/rowers/tasks.py
+++ b/rowers/tasks.py
@@ -408,7 +408,11 @@ def handle_c2_sync(workoutid, url, headers, data, debug=False, **kwargs):
     s = response.json()
     c2id = s['data']['id']
 
-    workout = Workout.objects.get(id=workoutid)
+    try:
+        workout = Workout.objects.get(id=workoutid)
+    except Workout.DoesNotExist:
+        return 0
+
     workout.uploadedtoc2 = c2id
     workout.save()
 
@@ -492,7 +496,11 @@ def handle_strava_sync(stravatoken, workoutid, filename, name, activity_type, de
         failed = True
 
     if not failed:
-        workout = Workout.objects.get(id=workoutid)
+        try:
+            workout = Workout.objects.get(id=workoutid)
+        except Workout.DoesNotExist:
+            return 0
+        
         workout.uploadedtostrava = res.id
         workout.save()
         try:
diff --git a/rowers/views/statements.py b/rowers/views/statements.py
index 4a1e3f01..f52cfac7 100644
--- a/rowers/views/statements.py
+++ b/rowers/views/statements.py
@@ -380,7 +380,11 @@ def createShareModel(request, model_id):  # pragma: no cover
 
 class JSONResponse(HttpResponse):
     def __init__(self, data, **kwargs):
-        content = JSONRenderer().render(data)
+        try:
+            content = JSONRenderer().render(data)
+        except ValueError:
+            content = ''
+
         kwargs['content_type'] = 'application/json'
         super(JSONResponse, self).__init__(content, **kwargs)