diff --git a/rowers/tests/test_units.py b/rowers/tests/test_units.py
index 198deef6..b540eeb3 100644
--- a/rowers/tests/test_units.py
+++ b/rowers/tests/test_units.py
@@ -160,7 +160,7 @@ class ForceUnits(TestCase):
         df = dataprep.read_data(['averageforce'],ids=[13])
         df = dataprep.remove_nulls_pl(df)
         average_N = int(df['averageforce'].mean())
-        self.assertEqual(average_N,119)
+        self.assertEqual(average_N,120)
 
 @override_settings(TESTING=True)
 class TestForceUnit(TestCase):
diff --git a/rowers/tests/testdata/testdata.tcx.gz b/rowers/tests/testdata/testdata.tcx.gz
index d906cfbf..346692ec 100644
Binary files a/rowers/tests/testdata/testdata.tcx.gz and b/rowers/tests/testdata/testdata.tcx.gz differ
diff --git a/rowers/views/analysisviews.py b/rowers/views/analysisviews.py
index a2c254f9..782c63bd 100644
--- a/rowers/views/analysisviews.py
+++ b/rowers/views/analysisviews.py
@@ -433,14 +433,16 @@ def trendflexdata(workouts, options, userid=0):
     yerror = []
     groupsize = []
     groupval = []
-    for key, item in groups:
-        xvalues.append(groups.get_group(key)[xparam].mean())
-        yvalues.append(groups.get_group(key)[yparam].mean())
-        xerror.append(groups.get_group(key)[xparam].std())
-        yerror.append(groups.get_group(key)[yparam].std())
-        groupsize.append(len(groups.get_group(key)[xparam]))
-        groupval.append(groups.get_group(key)[groupby].mean())
-
+    try:
+        for key, item in groups:
+            xvalues.append(groups.get_group(key)[xparam].mean())
+            yvalues.append(groups.get_group(key)[yparam].mean())
+            xerror.append(groups.get_group(key)[xparam].std())
+            yerror.append(groups.get_group(key)[yparam].std())
+            groupsize.append(len(groups.get_group(key)[xparam]))
+            groupval.append(groups.get_group(key)[groupby].mean())
+    except TypeError:
+        return('','Error: Unable to compute data')
 
     xvalues = pd.Series(xvalues)
     yvalues = pd.Series(yvalues)