Servlets :: Website Loads Correctly Only After A Refresh?

find out why when I access the site for the first time, it loads a blank white page, but when I reload it, it forwards me to the home page as it should.

I doubt that the reason is nothing else than the code below (in the doGet method):

String email = (String) request.getSession().getAttribute("email");
String cookieValue = null;
System.out.println(email);
// first, checking the session
if (email != null) {
request.getRequestDispatcher("/homelogged").forward(request, response);

[code].....

I suppose it's something with the session... because after I reload it, it works. But! When I close the browser and start all over again, the main page is white-blank again... And after a reload it works.

The exception:

SEVERE: Servlet.service() for servlet [first] in context with path [/MYSITE] threw exception
java.lang.NullPointerException
at controller.Controller.doGet(Controller.java:42)
Line 42 of the Controller is "for (int i = 0; i < cookies.length; i++) {"

P.S. I cleared all the cookies, but the problem persists.Also, the first it loads, it prints in console:

"null
been here 4!"

But, if I reload further, it prints:

"null
been here 4!
been here 2!
No Email! Literally, doGet!"