Why does the VK.api groups.getMembers function not always work?

Question

css

Here is a function for getting members of the Vkontakte group. Sometimes it doesn't work and gives an error: response.users' is null or not an object

function loadUsersGroup(grOffset, grId, clear) {
  VK.init(function() {	
    // выполняем запрос получения списка друзей
    VK.api("groups.getMembers", {group_id: grId, fields: "photo_100, photo_200", count: 9, offset: grOffset}, 
       function(data) {
         if (clear == 1) {
          $("#online").html('');
          $('#loader').fadeIn(1);
        }
        //alert(grOffset + ' ' + grId + ' ' + clear);
         	scrollMode = 2;
        idGroup = grId;
        startGroup = grOffset;
        var grCount = 0;
        var photoURL;
        grCount = data.response.users.length;
        var usersGroupHtml = [];
        //alert(grCount);
        for (var i=0; i<grCount; i++) {
          //j = i + 1;
          if(!!data.response.users[i].photo_200) 
            photoURL = data.response.users[i].photo_200;
          else
            photoURL = data.response.users[i].photo_100;
          //alert(photoURL);
          usersGroupHtml[i] = '<div class="photoBlock frame view view-first" style="background:url(' + photoURL + ');' + backgroundSize +'"><div class="mask"><h2>' + data.response.users[i].first_name + ' ' + data.response.users[i].last_name + '</h2></div></div>';
          $("#online").append(usersGroupHtml[i]);
        }
        $('#loader').fadeOut(1000);
       });
       });		
}

Answer 1

https://fengyuanchen.github.io/cropperjs/ ?

Answer 2

Hmm... where does data.response.users come from, if it should be data.items???