GHOSTED User

Encountered the same issue. IMDB must be serving different pages for testing…
The following 2 changes seem to resolve the issue:

In function highlightTitle()
if (!title)
title = document.querySelector("[data-testid=hero-title-block__title]");

In function highlightLinks()
if (!searchResultTitle)
searchResultTitle = a.querySelector("div > div[class*=searchResult__constTitle]");