Missing title
What it means
These indexable pages have no <title>, or an empty one. The title is the single strongest signal on the page and the headline of every search result, so a missing one costs both ranking and clicks.
How to fix it
Write a unique title for each page: the page's subject first, the site name last, between 30 and 60 characters. Describe what the page is, do not stuff keywords, and never reuse the same title across pages.
Finding it in CrawlStat
After a crawl, open Issues and pick Missing title. Click Show all in Pages to filter the Pages table to the affected pages, or Export affected to hand the list to whoever owns the fix. Audit ID: title_missing.