OK, I made the changes and committed to my repo but they did not update the pr, so I did a new pr with the corrected code: https://github.com/Fabrik/fabrik/pull/2039
For running J!5.1 you must https://fabrikar.com/forums/index.php?wiki/update-from-github/ or include the new file manually https://fabrikar.com/forums/index.php?threads/joomla-5-1-and-fabrik-cannot-find-files-error.54473/post-285151 See also Announcements
See Announcement
We are still working on the Joomla update.