Internal Server Error

PDOStatement: 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 'LIMIT 1' at line 1

[cms/framework/f3/base.php:2347] Base->error()
[cms/framework/f3/db/sql.php:239] user_error()
[cms/helpers/db.php:33] DB\SQL->exec()
[cms/helpers/db.php:25] Helpers\Db::_execute()
[helpers/max.php:13] Helpers\Db::getOne()
[tmp/1w157d3mk7xm1.7a3mmo6vk2md.php:3] Helpers\Max::corso()
[cms/framework/f3/base.php:2908] require('/var/www/vhosts/consultingsei.it/httpdocs/tmp/1w157d3mk7xm1.7a3mmo6vk2md.php')
[cms/framework/f3/base.php:3152] View->sandbox()
[cms/framework/rstemplate.php:143] Preview->render()
[cms/plugin.php:42] RsTemplate->render()
[plugins/mailup/base.php:167] Plugin->_render()
[cms/framework/pagetypes/plugin.php:45] Plugins\Mailup\Base->show()
[cms/models/pages.php:229] PageTypes\Plugin::render()
[cms/controllers/frontend.php:60] Models\Pages->render()
[cms/framework/f3/base.php:1960] Controllers\Frontend->index()
[cms/framework/f3/base.php:1759] Base->call()
[cms/app.php:24] Base->run()
[index.php:16] App->run()

DB LOG