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.
if (isset($this->showEmpty) && $this->showEmpty === false && trim(strip_tags($d == ''))) :
continue;
endif;?>
$dtest = trim(strip_tags($d));
if (isset($this->showEmpty) && $this->showEmpty === false && empty($dtest)) :
continue;
endif;?>