Fatal error: Uncaught mysqli_sql_exception: Duplicate entry 'ngg_doing_upgrade' for key 'wp_options.option_name' in /var/www/flexwood.dk/staging/wp-includes/wp-db.php:2033 Stack trace: #0 /var/www/flexwood.dk/staging/wp-includes/wp-db.php(2033): mysqli_query(Object(mysqli), 'INSERT INTO wp_...') #1 /var/www/flexwood.dk/staging/wp-includes/wp-db.php(1922): wpdb->_do_query('INSERT INTO wp_...') #2 /var/www/flexwood.dk/staging/wp-content/plugins/nextgen-gallery/src/Util/Installer.php(206): wpdb->query('INSERT INTO wp_...') #3 /var/www/flexwood.dk/staging/wp-content/plugins/nextgen-gallery/src/Util/Installer.php(138): Imagely\NGG\Util\Installer::_insert_upgrade_lock() #4 /var/www/flexwood.dk/staging/wp-content/plugins/nextgen-gallery/src/Util/Installer.php(267): Imagely\NGG\Util\Installer::can_do_upgrade() #5 /var/www/flexwood.dk/staging/wp-content/plugins/nextgen-gallery/nggallery.php(1199): Imagely\NGG\Util\Installer::update() #6 /var/www/flexwood.dk/staging/wp-includes/class-wp-hook.php(287): C_NextGEN_Bootstrap->update('') #7 /var/www/flexwood.dk/staging/wp-includes/class-wp-hook.php(311): WP_Hook->apply_filters(NULL, Array) #8 /var/www/flexwood.dk/staging/wp-includes/plugin.php(478): WP_Hook->do_action(Array) #9 /var/www/flexwood.dk/staging/wp-settings.php(546): do_action('init') #10 /var/www/flexwood.dk/staging/wp-config.php(93): require_once('/var/www/flexwo...') #11 /var/www/flexwood.dk/staging/wp-load.php(37): require_once('/var/www/flexwo...') #12 /var/www/flexwood.dk/staging/wp-blog-header.php(13): require_once('/var/www/flexwo...') #13 /var/www/flexwood.dk/staging/index.php(17): require('/var/www/flexwo...') #14 {main} thrown in /var/www/flexwood.dk/staging/wp-includes/wp-db.php on line 2033