www.blog.com/undefined causing delays in page load

Both pingdom and gtmetrix are reporting that a component on my website https://www.theworldreporter.com/undefined is causing delays in page load. There is nothing in my directory with that name, hence it is giving a 404 error.

I tried disabling all the plugins to check if some plugin was calling this url, but even then I saw this component there. I am not sure from where it is being called. But I want to get rid of it.

Pingdom is giving some technical information about it under waterfall tab but I do not understand wordpress yet.

Pingdom details about undefined : https://sdrv.ms/18WKOFG (Skydrive)

Please help me with your knowledge and experience.

Regards
Sanskar