# Saturday, November 19, 2016¶

Ticket #1273 was caused by an unused virtual field result (used by no layout). The solution was simple: remove that vrtual field.

But why did the error happen on the production site and not in our test suite? I verified that the polls.Polls table is being shown in Polls in Lino Welfare. So why did it not happen there? Answer: because the dangling field was not being evaluated there. But it is being evaluated by the lino.modlib.extjs renderer. So I wrote a new utility function walk_menu_items which would have seen this error I added to the specs of Lino Voga and Lino Welfare.