F.schettino
Italian
This would be a very good reason to upgrade.
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
Please see our announcement here.
So you should upgrade anyway.This is a required update for Joomla! 3.4, and strongly recommended for anyone running Fabrik 3.1 or 3.2, as it contains a security fix.