The new table ezurlalias_ml in 3.10 and 4.0 contains an entry in cleandata.sql which lacks its parent entry.

The cleandata.sql (and share/db_data.dba) file should be fixed by removing all entries in ezurlalias_ml, then re-importing all the old urls and remake the new ones (by using updateniceurls.php).

Steps to reproduce

Insert cleandata.sql in a database and do:

SELECT * FROM ezurlalias_ml WHERE parent = 23;

and then do:

SELECT * FROM ezurlalias_ml WHERE id = 23;

Alternatively run this to find all missing parents:

select a1.*, a2.link from ezurlalias_ml a1 left join ezurlalias_ml a2 on a1.parent=a2.id where a1.parent != 0  having a2.link is null;