Error 505

This error appears when I try to click UPGRADE button on Elementor to save changes. That’s the error reported in the log file:

WordPress database error You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ‘”1&#8243’ at line 1 for query SELECT * FROM wp_cpappbk_forms WHERE id=”1″ made by require(‘wp-blog-header.php’), require_once(‘wp-includes/template-loader.php’), include(‘/plugins/elementor/modules/page-templates/templates/header-footer.php’), Elementor\Modules\PageTemplates\Module->print_content, call_user_func, Elementor\Modules\PageTemplates\Module->print_callback, the_content, apply_filters(‘the_content’), WP_Hook->apply_filters, do_shortcode, preg_replace_callback, do_shortcode_tag, CP_AppBookingPlugin->filter_content, CP_AppBookingPlugin->insert_public_item, include(‘/plugins/appointment-hour-booking/cp-public-int.inc.php’), CP_APPBOOK_BaseClass->get_option

It seems to have to do with the appointment-hout-booking plugin, but the point is that I’ve already unistalled it and it’s not being used in any part of my WebSite.