[Zope] catalog reindex question

I have a question about catalog indexing. I have a product that when and item is edited, the catalog listing shows the item twice. Once with info from before editing and once with the updated info. The python script which is editing the item has the lines: self.reindex_object() if REQUEST is not None: return self.index_html(self, REQUEST) Is there a mistake here? How does one update the catalog correctly? I am using zope 2.4.3