diff --git a/rowers/interactiveplots.py b/rowers/interactiveplots.py
index be7360b5..6ad25d6a 100644
--- a/rowers/interactiveplots.py
+++ b/rowers/interactiveplots.py
@@ -5481,8 +5481,11 @@ def interactive_multiple_compare_chart(ids,xparam,yparam,plottype='line',
         else:
             windowsize = 1
 
-        if windowsize >= 3 and windowsize < len(group['y']):
-            group['y'] = savgol_filter(group['y'],windowsize,3)
+        if windowsize > 3 and windowsize < len(group['y']):
+            try:
+                group['y'] = savgol_filter(group['y'],windowsize,3)
+            except ValueError:
+                pass
 
         ylabel = Label(x=100,y=60+nrworkouts*20-20*cntr,
                        x_units='screen',y_units='screen',