when adding a feature, the option to save and enter another gives this error

[publicsphere]

/var/www/html/publicsphereproject/polymorphic/pps.php:677 SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near '(back) ( id INT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY, pid INT UNS...' at line 1 42000

In spite of that message, the the new feature seems to be entered