Upgraded and now getting:
XF\Db\Exception: MySQL query error [1364]: Field 'QT_best_answer_id' doesn't have a default value in src/XF/Db/AbstractStatement.php at line 217
XF\Db\AbstractStatement->getException() in src/XF/Db/Mysqli/Statement.php at line 196
XF\Db\Mysqli\Statement->getException()...