[HELP] Warning: A non-numeric value encountered

<?php
function load_postlike_script(){  
    wp_register_script('like_post', get_template_directory_uri().'/awpt/js/post-like/post-like.min.js', array('jquery'), '1.1', true );
    wp_enqueue_script('like_post');
    wp_localize_script('like_post', 'ajax_var', array(
    'url' => admin_url('admin-ajax.php'),
    'nonce' => wp_create_nonce('ajax-nonce')
));
add_action('wp_ajax_nopriv_post-like', 'adultwpthemes_post_like');
add_action('wp_ajax_post-like', 'adultwpthemes_post_like');
}
add_action('init', 'load_postlike_script');
$timebeforerevote = 1;//1 * 60min * 24h
function adultwpthemes_hasAlreadyVoted($post_id)
{
    global $timebeforerevote;

    $meta_IP = get_post_meta($post_id, "voted_IP");
    $voted_IP = isset($meta_IP[0]) ? $meta_IP[0] : '';
    if(!is_array($voted_IP))
        $voted_IP = array();
    $ip = $_SERVER['REMOTE_ADDR'];
   
    if(in_array($ip, array_keys($voted_IP)))
    {
        $time = $voted_IP[$ip];
        $now = time();
       
        if(round(($now - $time) / 60) > $timebeforerevote)
            return false;
           
        return true;
    }
   
    return false;
}
function adultwpthemes_getPostLikeLink($post_id) {
    global $awpt,$post;
    /*$rates = (int) get_post_meta( $post->ID, 'likes_count', true) + (int) get_post_meta( $post->ID, 'dislikes_count', true);
   $votes = adultwpthemes_getItemPostLikeRate( $post_id );*/
   $output = '<span class="vote-system">';
        $output .= '<div class="vote_buttons"><a href="#" data-post_id="'.$post_id.'" data-post_like="like" class="l-vote positivelike">
        <img src="' . get_bloginfo("template_url") . '/awpt/css/images/positivelike.png" alt="' . __('I like this video', 'adultwpthemes') . '">
        <i class="tool-tip"><em></em>' . __('Good', 'adultwpthemes') . '</i>
        </a>
      <a href="#" data-post_id="'.$post_id.'" data-post_like="dislike" class="l-vote negativelike">
      <img src="' . get_bloginfo("template_url") . '/awpt/css/images/negativelike.png" alt="' . __('I dont like this video', 'adultwpthemes') . '">
        <i class="tool-tip"><em></em>' . __('Bad', 'adultwpthemes') . '</i>
        </a>
      <div class="vote">
      <span>' . get_template_part( 'templates/vote', get_post_format() ) . '</span></div>
        </div>
      ';
      $output .= '</span>';
return $output;
}
function adultwpthemes_getPostLikeRate( $post_id ){
    $like_count     = get_post_meta($post_id, "likes_count", true);
    $dislike_count  = get_post_meta($post_id, "dislikes_count", true);
    $total_count    = $like_count + $dislike_count;
    if($total_count > 0)
        return $like_count / $total_count * 100;
    else
        return false;
}
function adultwpthemes_getItemPostLikeRate( $post_id ){
   
    if( adultwpthemes_getPostLikeRate($post_id) !== false )
        return floor( adultwpthemes_getPostLikeRate($post_id) ) . '%';
    else
        return '0%';
   
}