AJAX Anfrage auf dem Frontend kehrt immer zurück, wenn Benutzer nicht admin ist

Für das Plugin, das ich geschrieben habe, funktioniert AJAX request auf dem Frontend ordnungsgemäß, wenn ich Administrator bin , aber dasselbe funktioniert nicht, wenn ich es als normaler Benutzer versuche, es immer gibt 0 zurück.

Dies ist die Kern-PHP-Datei des Plugins, in der ich alles in die Warteschlange stelle und lokalisiere:

require_once ( plugin_dir_path(__FILE__) . 'like-user-request.php' );

function lr_enqueue_ui_scripts() {
    wp_enqueue_script( 'core-likeranker-js', plugins_url( 'js/like.js', __FILE__ ), array( 'jquery', 'jquery-ui-datepicker' ), false, true );
    wp_enqueue_style( 'jquery-style', 'http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.2/themes/smoothness/jquery-ui.css' );
    wp_localize_script( 'core-likeranker-js', 'my_ajax_object', array( 'ajax_url' => admin_url('admin-ajax.php'), 'security' => wp_create_nonce('user-like') ) );
}

add_action( 'wp_enqueue_scripts', 'lr_enqueue_ui_scripts');

Dies ist Javascript-Datei

jQuery(document).ready(function($){

var state = $('#post-like-count').data('user-state');

$('.like-button').on('click', function(){
    var count = $('#post-like-count').data('id');
    var postId = $('#post-like-count').data('post-id');
    state == 1 ? count++ : count--;

    $.ajax({
        url: my_ajax_object.ajax_url,
        type: 'POST',
        dataType: 'json',
        data: {
            action: 'save_like',
            likeCount: count,
            id: postId,
            userState: state,
            security: my_ajax_object.security
        },
        success: function(response) {
            if(response.success === true){
                $('#post-like-count').html(count + ' Likes');
                $('#post-like-count').data('id', count);
                if(state == 1){
                    state = 2;
                    $('.like-button').html('Dislike');
                }
                else {
                    state = 1;
                    $('.like-button').html('Like !');
                }
                $('#post-like-count').data('user-state', state);
            }
        },
        error:function(error) {
            $('.like-box').after('Error');
        }
    });
  })
});

PHP-Datei, die ich die Anfrage AJAX behandeln

<?php
function lr_save_like_request() {
    if ( ! check_ajax_referer( 'user-like', 'security' ) ) {
        wp_send_json_error( 'Invalid Nonce !' );
    }

    $count = $_POST['likeCount'];
    $postId = $_POST['id'];
    $ip;

    if ( ! empty( $_SERVER['HTTP_CLIENT_IP'] ) ) {
        //check ip from share internet
        $ip = $_SERVER['HTTP_CLIENT_IP'];
    } elseif ( ! empty( $_SERVER['HTTP_X_FORWARDED_FOR'] ) ) {
        //to check ip is pass from proxy
        $ip = $_SERVER['HTTP_X_FORWARDED_FOR'];
    } else {
        $ip = $_SERVER['REMOTE_ADDR'];
    }

    $voters_ip = get_post_meta( $postId, '_voters_ip', false );

    $flag = empty( $voters_ip ) ? 1 : 0;

    if( $_POST['userState'] == 1 ) {
        if( $flag == 1 ) {
            $voters_ip_buffer = $voters_ip;
            $voters_ip_buffer[] = $ip;
        } else {
            $voters_ip_buffer = $voters_ip[0];
            $voters_ip_buffer[] = $ip;
        }
    } else {
        $voters_ip_buffer = $voters_ip[0];
        for ( $i=0; $i < count($voters_ip_buffer); $i++ ) {
            if( $ip == $voters_ip_buffer[$i] ) {
                unset( $voters_ip_buffer );
            }
        }
    }

    if( ! update_post_meta( $postId, '_Like', $count ) ) {
        add_post_meta ( $postId, '_Like', $count, true );
    }

    if( ! update_post_meta( $postId, '_voters_ip', $voters_ip_buffer ) ) {
        add_post_meta ( $postId, '_voters_ip', $voters_ip_buffer, true );
    }

    wp_send_json_success( array(
        'state' => $_POST['userState']
    ));

    wp_die();
}

add_action( 'wp_ajax_save_like', 'lr_save_like_request' );