fix-empty-string-checkbox-redirect.php

<?php

if ( ! defined( 'ABSPATH' ) ) { exit; } elseif ( defined( 'WP_CLI' ) && WP_CLI ) { return; }

add_action( 'plugins_loaded', 'wpmudev_forminator_fix_redirect_blank_space', 100 );

function wpmudev_forminator_fix_redirect_blank_space() {
	if ( class_exists( 'Forminator' ) ) {
		class WPMUDEV_FIX_redirect_blank_space{
			private $form_id = 41393; //enter form_id here
			private $can_redirect = false;

			public function __construct(){
				add_action( 'forminator_custom_form_submit_before_set_fields', array( $this, 'form_id_checker' ), 10, 2 );
				add_filter( 'forminator_replace_form_data', array( $this, 'redirect_fix'), 20, 1 );
			}

			public function form_id_checker( $entry, $form_id ){
				if( $this->form_id == $form_id ){
				 	$this->can_redirect = true;
				}
			}

			public function redirect_fix( $content ){

				if( $this->can_redirect ){
					$content = str_replace( ' ', '', $content );
				}
				return $content;
			}

		}

		$run = new WPMUDEV_FIX_redirect_blank_space;
	}
}