fix

rowers/interactiveplots.py

@@ -2168,7 +2168,10 @@ def interactive_multiple_compare_chart(ids, xparam, yparam, plottype='line',
 
     metrics_list = [{'name': name, 'rowingmetrics':d } for name, d in metrics.rowingmetrics]
 
-    workoutsdict = [{'id': id, 'label': labeldict[id]} for id in ids]
+    try:
+        workoutsdict = [{'id': id, 'label': labeldict[id]} for id in ids]
+    except KeyError:
+        return ['<p>Chart error</p>','']
 
     chart_data = {
         'title': '',