diff --git a/rowers/views/analysisviews.py b/rowers/views/analysisviews.py
index a60a1d1b..e1cbcaba 100644
--- a/rowers/views/analysisviews.py
+++ b/rowers/views/analysisviews.py
@@ -4848,6 +4848,8 @@ def history_view_data(request,userid=0):
         typeselect = 'All'
 
     yaxis = request.GET.get('yaxis','duration')
+    if yaxis not in ['duration','rscore','trimp']:
+        yaxis = 'duration'
 
     g_workouts = Workout.objects.filter(
         user=r,