Only update saved_data if the chart could be saved

src/ag-window.c

@@ -1120,11 +1120,11 @@ ag_window_save_action(GSimpleAction *action,
                     _("Unable to save: %s"),
                     err->message
                 );
-        }
-
+        } else {
             ag_db_chart_save_unref(priv->saved_data);
             priv->saved_data = save_data;
         }
+    }
 }
 
 static void