Steps to reproduce the issue

After updating to Joomla 4.1.5 (of a Joomla 3.10.10 site that already used smart search and in which indexing was successful), during the indexing of the search, it stops at about 1/4 returning the error message "An error has occurred. The category must have a title".

Expected result

Complete indexing at 100%, or I would like to know specifically what is the problem (the category) that prevents indexing from completing

Actual result

Smart Search Content Indexing stops with message: An error has occurred. Category must have a title.

System information (as much as possible)

database mysql 10.3.24-MariaDB
php 7.4.22
web server Apache
Joomla! 4.1.5 Stable

Additional comments

I checked in all categories (even in the database) and there is none without a name. I checked the author / article pairings and there is no "orphaned" author article, as assumed here: #36759. I ask for help