diff --git a/rowers/interactiveplots.py b/rowers/interactiveplots.py
index b4e4a6ed..3d84fb68 100644
--- a/rowers/interactiveplots.py
+++ b/rowers/interactiveplots.py
@@ -4291,8 +4291,8 @@ def instroke_multi_interactive_chart(selected, *args, **kwargs):
         xvals = np.arange(len(mean_vals))
         xname = 'x_'+str(analysis.id)
         yname = 'y_'+str(analysis.id)
-        df_plot[xname] = xvals
-        df_plot[yname] = mean_vals
+        df_plot[xname] = pd.Series(xvals)
+        df_plot[yname] = pd.Series(mean_vals)
 
     if len(metrics) > 1:
         for analysis in selected: