In general, the Moz site crawl should point out the page(s) in which the offending link was found, and this is always a good place to start to track down the underlying cause.
I am finding your issue in the breadcrumbs of the post detail page itself. Looking at the source code of http://www.rrbusinessconsultants.com/rr-business-consultants-on-the-rise-of-glassdoor-and-how-companies-are-coping/ I find this HTML code snippet within the breadcrumbs:
[](<a class="html-attribute-value html-external-link" href="http://www.rrbusinessconsultants.com/rr-business-consultants-on-the-rise-of-glassdoor-and-how-companies-are-coping/void(null);" target="_blank">void(null);</a>)
Since you are using Wordpress, I would assume the site is using a breadcrumbs plugin, and this is likely going to be your culprit. My advice would be to inspect the plugin in use and any code or shortcodes that are being used to generate the site breadcrumbs. You'll likely find some offending code causing this unnecessary anchor tag. If you need any additional help, please let me know!
