PHP session after Load ()

I'm having a little problem with my session ..

When I reload the page by the function load() , my session does not update and the message is displayed

Notice: Undefined variable: _SESSION

As I understand it, using load() , session data is lost.

Is there a way to solve this problem?

 $(".editoraview h1").click(function(event) {
        $.ajax({
          url: 'classes/consulta.php',
          success : function(txt){
            $('#view-full').load('classes/consulta.php');
          },
          error: function(result) {
            alert("Erro");
          }
        });
    });

Thank you = D