Pretty much the same function, just added 'ignore' to to_native_str()

def _extract_links(self, selector, response_url, response_encoding, base_url):
        '''
        Pretty much the same function, just added 'ignore' to to_native_str()
        '''
        links = []
        # hacky way to get the underlying lxml parsed document
        for el, attr, attr_val in self._iter_links(selector.root):
            # pseudo lxml.html.HtmlElement.make_links_absolute(base_url)
            try:
                attr_val = urljoin(base_url, attr_val)
            except ValueError:
                continue # skipping bogus links
            else:
                url = self.process_attr(attr_val)
                if url is None:
                    continue
            # added 'ignore' to encoding errors
            url = to_native_str(url, encoding=response_encoding,
                                errors='ignore')
            # to fix relative links after process_value
            url = urljoin(response_url, url)
            link = Link(url, _collect_string_content(el) or u'',
                        nofollow=rel_has_nofollow(el.get('rel')))
            links.append(link)
        return self._deduplicate_if_needed(links)