current_event may not exist, and so url_helper may fail

Author: amatsuda

app/helpers/navbar_helper.rb

@@ -55,10 +55,10 @@ def nav_item_class(key)
       NAV_ITEM_MAP.find do |nav_key, nav_val|
         case nav_val
         when Proc
-          @active_nav_key = nav_key if instance_exec(request.path, &nav_val)
+          @active_nav_key = nav_key if instance_exec(request.path, &nav_val) rescue nil
         when Hash
           nav_val.find do |subnav_key, subnav_val|
-            @active_nav_key, @active_subnav_key = nav_key, subnav_key if instance_exec(request.path, &subnav_val)
+            @active_nav_key, @active_subnav_key = nav_key, subnav_key if instance_exec(request.path, &subnav_val) rescue nil
           end
         end
       end