Data is null after add/edit on Chrome, it's ok with FF or IE

Hi, when I add a new entry or edit an existing one, it doesn't work on Chrome, but it's ok on FF and IE (it used to be ok in Chrome, and I did not touch anything).

It's in the AJAX submit function :

$('#crudForm').submit(function(){
$(this).ajaxSubmit({
  url: validation_url,
  dataType: 'json',

  success: function(data){

    //Here, data is null on Chrome, but not on FF or IE
    console.log('success ', data);

    $("#FormLoading").hide();

    if(data.success)
    {

Any idea what is the problem ? Maybe a Chrome update ? Version is 83.0.4103.61 and bug occures on Win & Mac.

thank you !

Data is null after add/edit on Chrome, it's ok with FF or IE

zanorg