Fixed: 8.4.0 - An exception occurred while executing 'INSERT INTO UserWorkflowProgress (uID, wpID) VALUES (?, ?)' with params [null, \"25\"]:\n\nSQLSTATE: Integrity constraint violation: 1048 Column 'uID' cannot be null (thanks dimger)
Fixed bug in migrating data where sites already had the Page Selector add-on installed, and some attribute values were null (Doctrine\DBAL\Exception\ForeignKeyConstraintViolationException) (thanks mlocati)
Fixed inability to upgrade to 8.4.1 from 126.96.36.199.
Fix infinite redirection visiting existing dirs when seo.trailing_slash is false (thanks mlocati)